Youssef Attia | Damanhour University (original) (raw)

Papers by Youssef Attia

Research paper thumbnail of Value for rice bran, its maximal utilisation and its upgrading by phytase and other enzymes and diet-formulation based on available amino acids in the diet for broilers

Archiv Fur Geflugelkunde, 2003

Research paper thumbnail of Nitrate detoxification using antioxidants and probiotics in the water for rabbits

Revista Colombiana de Ciencias Pecuarias, 2018

Detoxificación de nitrato usando antioxidantes y probióticos en el agua para conejos Detoxificaçã... more Detoxificación de nitrato usando antioxidantes y probióticos en el agua para conejos Detoxificação de nitrato usando antioxidantes e probióticos na água para coelhos

Research paper thumbnail of Alternative to antibiotic growth promoters: beneficial effects of Saccharomyces cerevisiae and/or Lactobacillus acidophilus supplementation on the growth performance and sustainability of broilers’ production

Frontiers in Veterinary Science

Although antibiotics growth promoters (AGPs), including zinc-bacitracin (ZnB), can threaten human... more Although antibiotics growth promoters (AGPs), including zinc-bacitracin (ZnB), can threaten human health due to developing antimicrobial resistance, as well as drug residue in animal and poultry products, ZnB is still widely used, particularly in developing countries, for the sustainability of poultry farming. The present investigation aims to assess the use of Saccharomyces cerevisiae and Lactobacillus acidophilus, with or without a prebiotic (mannooligosaccharide, MOS), as alternatives to ZnB. For this reason, 150 one-day-old chicks were grouped into six groups, designated negative control, LA, SC, ZnB, SA + MOS, and LA + MOS (5 replicates of 5 chicks for each group). Chicks kept in the control group were fed the basal diet. Chickens kept in LA and SC groups received L. acidophilus, S. cerevisiae at a 1 g/kg diet and 2 g/Kg, respectively. Chickens kept in ZnB received ZnB at 0.5 g/kg. Chicks kept in the SC + MOS and LA + MOS were fed a basal diet containing 2 g S. cerevisiae + 1 g...

Research paper thumbnail of Corrigendum: The impact of multi-enzyme fortification on growth performance, intestinal morphology, nutrient digestibility, and meat quality of broiler chickens fed a standard or low-density diet

Frontiers in Veterinary Science

The impact of multi-enzyme fortification on growth performance, intestinal morphology, nutrient d... more The impact of multi-enzyme fortification on growth performance, intestinal morphology, nutrient digestibility, and meat quality of broiler chickens fed a standard or low-density diet.

Research paper thumbnail of In ovo nano-silver and nutrient supplementation improves immunity and resistance against Newcastle disease virus challenge in broiler chickens

Frontiers in Veterinary Science

Silver nanoparticles (AgNPs) interact with the microbes and host immune system to protect against... more Silver nanoparticles (AgNPs) interact with the microbes and host immune system to protect against diseases. Fertile broiler eggs (n = 900) were allotted to six groups: un-injected control, sham (sterile water), AgNPs (50 μg), AgNPs+Amino acids (Methionine-10 mg + Arginine-25 mg), AgNPs+Vitamins (Vit B1-72μg + Vit B6-140μg), and AgNPs+Trace Elements (Zn-80 μg and Se-0.3 μg) and incubated for 18 days. On 18th embryonic day, 0.6 ml test solution was injected at the broad end of egg using 25 mm needle and transferred to hatcher. Post-hatch, half of the chicks from each group were vaccinated with Newcastle disease (ND) vaccine, and the other half were kept as unvaccinated unit and reared for 42 d with standard management practices. Hatchability, 1st and 42nd d body weight, feed intake, and feed conversion ratio were similar between treatment groups in both vaccinated and unvaccinated units. The relative weight of bursa Fabricius and thymus was similar, but spleen weight was higher (P ≤ 0...

Research paper thumbnail of Responses of egg quality sustainability, sensory attributes and lipid profile of eggs and blood to different dietary oil supplementations and storage conditions

Italian Journal of Animal Science

Research paper thumbnail of Low inclusion levels of Tenebrio molitor larvae meal in laying Japanese quail (Coturnix japonica, Gould, 1837) diet improve the intestinal morphometry, enzymatic activity and caecal short chain fatty acids profile

Research in Veterinary Science

Research paper thumbnail of Behavioral, physiological, and inflammatory responses of Oreochromis niloticus fish exposed to thallium and/or supplementation with Astragalus membranaceus polysaccharides

Research paper thumbnail of Dietary distilled fatty acids and antioxidants improve nutrient use and performance of Japanese male quails

Research paper thumbnail of Responses of broiler chicken to different oil levels within constant energy levels from 20 to 40 days of age under hot weather conditions

Italian Journal of Animal Science, 2021

Abstract In total, 144 Arbour Acres broiler chickens were distributed among four treatment groups... more Abstract In total, 144 Arbour Acres broiler chickens were distributed among four treatment groups (six replicates per treatment; six chickens per replicate) during days 20–40 of age. The chickens were offered iso-caloric and iso-nitrogenous diets containing four dietary oil levels (DOL): 0 (oil non-supplemented diet, control), 2, 4, and 6% in a relatively low-energy diet (12.4 MJ ME/kg diet). During the experimental period, the chickens were reared under natural hot weather conditions (32.5 ± 4 °C, 54 ± 7% relative humidity). Growth, feed conversion ratio (FCR), protein (PCR), metabolisable energy (MECR) ratio, and European production efficiency index (EPEI) were similar among groups fed up to 4% DOL but raising DOL to 6% impaired these traits. Besides, DOL at 6% decreased digestibility of dry matter, crude protein, and ash. Furthermore, a 6% DOL showed the lowest digestibility of dry matter, crude protein, and ash. Dressing percentage was the highest in 2%, and abdominal fat percentage showed the same trend in 6% DOL, but the gizzard percentage was the lowest in 6% DOL. The liver percentage increased significantly with fat/oil inclusion compared to the control. Meat dry matter and either extract increased considerably due to offering different DOLs, with maximum values at 6%. The inclusion of dietary oils in diets significantly increased serum malondialdehyde (MDA) but decreased serum total antioxidant capacity (TAC)/MDA ratio compared to the 0% DOL. In conclusion, under natural summer conditions, from 20 to 40 days of age, broilers' best productive characteristics were achieved using 0-2% DOL, and the best immune response was obtained for 4–6% DOL. Highlights Hot weather negatively influences the productivity of broilers. Fats/oils are essential for animal and human nutrition for several reasons; however, they are expensive compared to other energy sources. Improving the production index is essential to keep broilers farming profits under hot weather.

Research paper thumbnail of Control of Environmental Pollution Related to Poultry Production in Egypt

Although poultry provides an economically sound alternative protein source worldwide, negative en... more Although poultry provides an economically sound alternative protein source worldwide, negative environmental effects attributable to poultry production in Egypt have not been addressed. The environmental hazard arising from excess nitrogen and phosphorus in poultry waste as well as other contaminants such as drug residues, pathogenic organisms, and viruses (like avian influenza) could be eliminated via nutritional and management interventions, and attention in the media has increased greatly (media@environmentaldefense.org). Soil, water, and air pollution, and transmitted diseases have been reported worldwide and methods of controlling them have been discussed in the literature. Nutrient concentrations, dietary manipulation, and waste management may play an important role in these areas. Biotechnology may offer interesting tools for improving nutrient utilization and eliminating nutrient waste, while protecting the environment from excess pollutants, including animal wastes. On the ...

Research paper thumbnail of Magnetized drinking water improves productivity and blood parameters in geese

Revista Colombiana de Ciencias Pecuarias, 2017

Magnetized drinking water improves productivity and blood parameters in geese ¤ El agua de bebida... more Magnetized drinking water improves productivity and blood parameters in geese ¤ El agua de bebida magnetizada mejora la productividad y los parámetros sanguíneos en gansos A água magnetizada melhora a produtividade e os parâmetros sanguíneos em gansos

Research paper thumbnail of Growth performance, digestibility, intestinal morphology, Carcass traits and meat quality of broilers fed marginal nutrients deficiency-diet supplemented with different levels of active Yeast

Livestock Science, 2020

A total of 216 one-day-old Arbor Acres broiler chicks were randomly distributed among 36 cages of... more A total of 216 one-day-old Arbor Acres broiler chicks were randomly distributed among 36 cages of 6 replicates per treatment and 6 birds per cage during 1-38 d of age. A factorial design (2 × 3) was used in which there were two feed rations [standard diet vs. marginal nutrients deficiency-diet (MNDD)] and three Saccharomyces cerevisiae (SC, active yeast) concentrations (0, 0.02 and 0.04%). The results showed that marginal nutrients deficiency-diet significantly decreased growth rate and production index during the experimental period and this accounted for 5.4% for the whole period. The MNDD impaired feed conversion ratio (FCR) during 1-21 d of age, but FCR for the whole period was not affected. Addition of SC at 0.04% significantly improved growth rate and increased organic matter digestibility and apparent ash retention, compared to 0.02% diet. Addition of SC had a significant effect on percentage of gastrointestinal tract and length of villi. Dressing percentage was significantly higher for the group fed on MNDD than those on the standard diet. The increase in the dressing percentage was associated with significantly higher gizzard, gut percentage and length of the intestine. The type of diet, the SC concentration, and the interaction between them had no significant effects on the chemical composition and the physical characteristics of the meat. It could be concluded that SC supplementation to standard-or MNDD improved growth performance of broiler chickens. Hence, feeding MNDD supplemented with either 0.02 or 0.04% SC showed higher growth performance than the standard diet without SC supplementation.

Research paper thumbnail of Nutrients profile, protein quality and energy value of whole Prosopis pods meal as a feedstuff for poultry feeding

Italian Journal of Animal Science, 2018

The chemical composition, tannins level, mineral profile, fatty acids profile and amino acids pro... more The chemical composition, tannins level, mineral profile, fatty acids profile and amino acids profile of whole Prosopis pods meal (WPPM) were determined. In addition, apparent energy metabolisability (AEM) and true energy metabolisability (TEM) and apparent (AAAD) and true (TAAD) amino acids digestibility were determined via a precision-feeding assay. Protein quality was also determined via a total protein efficiency assay. The tannins content of WPPM was 42.8 mg/g dry matter. WPPM showed 15.2% crude protein, 2.61% ether extract, 18.58% crude fibre and 6.04% ash, with 5.44 and 7.57 MJ/kg AEM and TEM, respectively. The WPPM contained 0.66% Ca, 0.20% P, 764 ppm Fe, 69.4 ppm Zn, 33.9 ppm Mn, 36.1 ppm Cu, 21.7 ppm Cr, 7.4 ppm Cd, 9.8 ppm Ni and 28.2 ppm Pb. The WPPM showed 92.54% total fatty acids, of which 25.33% were saturated fatty acids and 67.21% unsaturated fatty acids; of the latter, 37.83% were monounsaturated and 29.37% polyunsaturated. Threonine, valine, methionine, isoleucine, leucine, phenylalanine, histidine, lysine, arginine and tryptophan levels were 0.47, 0.67, 0.12, 0.54, 1.03, 0.40, 0.20, 0.46, 0.67 and 0.44%, respectively. Therefore, WPPM can meet 1.08% of the total amino acids requirements of broiler chickens from 1 to 21 days of age. The AAAD and TAAD of the WPPM were 34.9 and 65.0%, respectively. The protein quality of WPPM was 23.4% lower than that of soybean meal. In conclusion, WPPM contains a considerable amount of energy and nutrients (protein, minerals, fatty acids and amino acids), but its protein quality is lower than that of soybean meal.

Research paper thumbnail of Soya lecithin and season affect the productive performance, nutrient digestibility, and blood constituents of growing rabbits

Journal of Animal and Feed Sciences, 2018

Research paper thumbnail of Bee pollen and propolis as dietary supplements for rabbit: Effect on reproductive performance of does and on immunological response of does and their offspring

Journal of Animal Physiology and Animal Nutrition, 2019

To evaluate the effect of bee pollen (BP) and/or propolis (Pro) supplementation on rabbit does, 6... more To evaluate the effect of bee pollen (BP) and/or propolis (Pro) supplementation on rabbit does, 64 nulliparous NZW rabbits does were distributed among eight groups (eight animals/group). One unsupplemented group was the control; the other seven groups were supplemented, respectively, with zinc bacitracin (ZnB) at 100 mg, BP at 150 and 300 mg, Pro at 150 and 300 mg, BP+Pro at 150 and 300 mg of each three times/week, day after day continuously along eight parities. The BP300, Pro300 and BP+Pro150 groups had higher body weight of litter at birth and number of kids born alive. The BP supplementation at 150 mg increased plasma total protein and albumin than the control group. The BP or Pro at 150 mg decreased plasma T3 than the other groups except for BP+Pro150. The ZnB group had significantly greater T3/T4 ratio compared to BP, Pro and BP+Pro at 150 mg. The BP+Pro150 group had less ALT than the control; BP300 and Pro 300 mg resulted in lower plasma AST than the groups Pro150 with or wit...

Research paper thumbnail of Productive and reproductive performance of rabbits does as affected by bee pollen and/or propolis, inulin and/or mannan-oligosaccharides

World Rabbit Science, 2015

The aim of the paper was to compare the effect of prebiotics (inulin and/or mannan-oligosaccharid... more The aim of the paper was to compare the effect of prebiotics (inulin and/or mannan-oligosaccharides, MOS) and bee products (bee pollen and/or propolis) on productive and reproductive performance of rabbit does. Seventy nulliparous V-line female rabbits were distributed among 7 groups. The groups were fed the same diet and received no supplements (control group), natural molecules (bee pollen and/or propolis) at 200 mg/kg body weight (BW) or prebiotics (inulin and/or MOS) at 35 mg/kg BW. Productive, reproductive, biochemical and haematological traits were investigated. Bee pollen with propolis significantly increased body weight gain of does 1 wk after mating (3.53%), decreased feed intake (4.49%) and caused larger litter size (39.4%), heavier body weight of litter (17.7%), a greater number of kits born alive (48.7%), higher weight of kits (87.81%) at 28 d of age, higher milk yield (43.6%) and more favourable milk conversion ratio (31.6%). Moreover, bee pollen with propolis had signi...

Research paper thumbnail of Daily Energy Allotments and Performance of Broiler Breeders

Poultry Science, 1995

The effects of daily energy intake on reproductive performance of Arbor Acres males and on growth... more The effects of daily energy intake on reproductive performance of Arbor Acres males and on growth of their offspring was studied. In Experiment 1, 21 males were placed in individual pens with 12 females. Three rations, differing in energy, were fed from 24 to 57 wk of age with seven males receiving either 300, 340, or 380 kcal ME/d. In Experiment 2, 32 individually caged males were given daily allotments of 280, 320, 360, or 360 kcal ME/d from 26 to 32 wk of age and 300, 340, 380, or 380 kcal ME/d from 32 to 38 wk. Rations of the two groups of males fed the highest energy level differed in formulation, one being the same wheat short-based basal ration as fed to the two lower energy groups, only with additional fat, and the other being a corn-soybean-based ration. Body weight and testes weight were increased with increased energy allotment in both experiments but carcass composition was unaltered. There were no significant effects of energy intake on fertility or hatchability in either experiment. Even though mean differences were not significant, fertility in two pens dropped to near zero at 38 wk in Experiment 1. Semen characteristics and plasma testosterone concentrations were unaffected by energy intake in Experiment 2. There was a significant linear increase in 6-wk BW of broilers associated with the increase in sire energy intake in each of three batches of broilers grown in Experiment 1 and in one of two batches of broilers grown in Experiment 2.

Research paper thumbnail of Daily Energy Allotment and Reproductive Performance of Broiler Breeder Males

Poultry Science, 1993

Abstract Ross broiler breeder males, housed in floor pens with females and fed from separate feed... more Abstract Ross broiler breeder males, housed in floor pens with females and fed from separate feeders, were given 125 g/day of isonitrogenous diets formulated to provide 300, 340, and 380 kcal per male per day between 28 and 60 wk of age. Males given 300 kcal/day maintained their initial BW and were consistently lighter than those fed the two higher energy levels; BW of males given the two higher energy allotments did not differ from each other. Fertility levels, over the whole experiment, averaged 80.1, 91.1, and 83.0% for the low-, intermediate-, and high-energy groups, respectively. Fertility dropped slightly over time in all groups but showed a precipitous fall in the low-energy group between 48 and 60 wk. Hatchability of fertile eggs showed a significant decrease over time but no treatment differences were found. Hatchability of eggs set, like fertility, showed a significant quadratic regression on energy allocation. A significant linear effect of energy level on 60-wk testes weights was found but carcass composition at 60 wk was unrelated to dietary energy allocation. Males fed 300 kcal/day had less severe pododermatitis than males in other groups, but the correlation between BW and pododermatitis score was not significant. Average 6-wk BW of approximately 500 offspring of males fed the low-energy diet, raised comingled with those from other male treatments in three separate growth trials, were consistently and significantly lower than those of offspring of males fed 380 kcal/day.

Research paper thumbnail of Enhanced separation of pyrite from oxidized coal by froth flotation using biosurface modification

International Journal of Mineral Processing, 1993

... Vaaler, LE and Attia, YA, 1983. Microbial modification of mineral surfaces to change flotatio... more ... Vaaler, LE and Attia, YA, 1983. Microbial modification of mineral surfaces to change flotation characteristics. In: Report of Invention, Battelle-Columbus Laboratories, Columbus, OH. Corresponding Author Contact Information Corresponding author. ...

Research paper thumbnail of Value for rice bran, its maximal utilisation and its upgrading by phytase and other enzymes and diet-formulation based on available amino acids in the diet for broilers

Archiv Fur Geflugelkunde, 2003

Research paper thumbnail of Nitrate detoxification using antioxidants and probiotics in the water for rabbits

Revista Colombiana de Ciencias Pecuarias, 2018

Detoxificación de nitrato usando antioxidantes y probióticos en el agua para conejos Detoxificaçã... more Detoxificación de nitrato usando antioxidantes y probióticos en el agua para conejos Detoxificação de nitrato usando antioxidantes e probióticos na água para coelhos

Research paper thumbnail of Alternative to antibiotic growth promoters: beneficial effects of Saccharomyces cerevisiae and/or Lactobacillus acidophilus supplementation on the growth performance and sustainability of broilers’ production

Frontiers in Veterinary Science

Although antibiotics growth promoters (AGPs), including zinc-bacitracin (ZnB), can threaten human... more Although antibiotics growth promoters (AGPs), including zinc-bacitracin (ZnB), can threaten human health due to developing antimicrobial resistance, as well as drug residue in animal and poultry products, ZnB is still widely used, particularly in developing countries, for the sustainability of poultry farming. The present investigation aims to assess the use of Saccharomyces cerevisiae and Lactobacillus acidophilus, with or without a prebiotic (mannooligosaccharide, MOS), as alternatives to ZnB. For this reason, 150 one-day-old chicks were grouped into six groups, designated negative control, LA, SC, ZnB, SA + MOS, and LA + MOS (5 replicates of 5 chicks for each group). Chicks kept in the control group were fed the basal diet. Chickens kept in LA and SC groups received L. acidophilus, S. cerevisiae at a 1 g/kg diet and 2 g/Kg, respectively. Chickens kept in ZnB received ZnB at 0.5 g/kg. Chicks kept in the SC + MOS and LA + MOS were fed a basal diet containing 2 g S. cerevisiae + 1 g...

Research paper thumbnail of Corrigendum: The impact of multi-enzyme fortification on growth performance, intestinal morphology, nutrient digestibility, and meat quality of broiler chickens fed a standard or low-density diet

Frontiers in Veterinary Science

The impact of multi-enzyme fortification on growth performance, intestinal morphology, nutrient d... more The impact of multi-enzyme fortification on growth performance, intestinal morphology, nutrient digestibility, and meat quality of broiler chickens fed a standard or low-density diet.

Research paper thumbnail of In ovo nano-silver and nutrient supplementation improves immunity and resistance against Newcastle disease virus challenge in broiler chickens

Frontiers in Veterinary Science

Silver nanoparticles (AgNPs) interact with the microbes and host immune system to protect against... more Silver nanoparticles (AgNPs) interact with the microbes and host immune system to protect against diseases. Fertile broiler eggs (n = 900) were allotted to six groups: un-injected control, sham (sterile water), AgNPs (50 μg), AgNPs+Amino acids (Methionine-10 mg + Arginine-25 mg), AgNPs+Vitamins (Vit B1-72μg + Vit B6-140μg), and AgNPs+Trace Elements (Zn-80 μg and Se-0.3 μg) and incubated for 18 days. On 18th embryonic day, 0.6 ml test solution was injected at the broad end of egg using 25 mm needle and transferred to hatcher. Post-hatch, half of the chicks from each group were vaccinated with Newcastle disease (ND) vaccine, and the other half were kept as unvaccinated unit and reared for 42 d with standard management practices. Hatchability, 1st and 42nd d body weight, feed intake, and feed conversion ratio were similar between treatment groups in both vaccinated and unvaccinated units. The relative weight of bursa Fabricius and thymus was similar, but spleen weight was higher (P ≤ 0...

Research paper thumbnail of Responses of egg quality sustainability, sensory attributes and lipid profile of eggs and blood to different dietary oil supplementations and storage conditions

Italian Journal of Animal Science

Research paper thumbnail of Low inclusion levels of Tenebrio molitor larvae meal in laying Japanese quail (Coturnix japonica, Gould, 1837) diet improve the intestinal morphometry, enzymatic activity and caecal short chain fatty acids profile

Research in Veterinary Science

Research paper thumbnail of Behavioral, physiological, and inflammatory responses of Oreochromis niloticus fish exposed to thallium and/or supplementation with Astragalus membranaceus polysaccharides

Research paper thumbnail of Dietary distilled fatty acids and antioxidants improve nutrient use and performance of Japanese male quails

Research paper thumbnail of Responses of broiler chicken to different oil levels within constant energy levels from 20 to 40 days of age under hot weather conditions

Italian Journal of Animal Science, 2021

Abstract In total, 144 Arbour Acres broiler chickens were distributed among four treatment groups... more Abstract In total, 144 Arbour Acres broiler chickens were distributed among four treatment groups (six replicates per treatment; six chickens per replicate) during days 20–40 of age. The chickens were offered iso-caloric and iso-nitrogenous diets containing four dietary oil levels (DOL): 0 (oil non-supplemented diet, control), 2, 4, and 6% in a relatively low-energy diet (12.4 MJ ME/kg diet). During the experimental period, the chickens were reared under natural hot weather conditions (32.5 ± 4 °C, 54 ± 7% relative humidity). Growth, feed conversion ratio (FCR), protein (PCR), metabolisable energy (MECR) ratio, and European production efficiency index (EPEI) were similar among groups fed up to 4% DOL but raising DOL to 6% impaired these traits. Besides, DOL at 6% decreased digestibility of dry matter, crude protein, and ash. Furthermore, a 6% DOL showed the lowest digestibility of dry matter, crude protein, and ash. Dressing percentage was the highest in 2%, and abdominal fat percentage showed the same trend in 6% DOL, but the gizzard percentage was the lowest in 6% DOL. The liver percentage increased significantly with fat/oil inclusion compared to the control. Meat dry matter and either extract increased considerably due to offering different DOLs, with maximum values at 6%. The inclusion of dietary oils in diets significantly increased serum malondialdehyde (MDA) but decreased serum total antioxidant capacity (TAC)/MDA ratio compared to the 0% DOL. In conclusion, under natural summer conditions, from 20 to 40 days of age, broilers' best productive characteristics were achieved using 0-2% DOL, and the best immune response was obtained for 4–6% DOL. Highlights Hot weather negatively influences the productivity of broilers. Fats/oils are essential for animal and human nutrition for several reasons; however, they are expensive compared to other energy sources. Improving the production index is essential to keep broilers farming profits under hot weather.

Research paper thumbnail of Control of Environmental Pollution Related to Poultry Production in Egypt

Although poultry provides an economically sound alternative protein source worldwide, negative en... more Although poultry provides an economically sound alternative protein source worldwide, negative environmental effects attributable to poultry production in Egypt have not been addressed. The environmental hazard arising from excess nitrogen and phosphorus in poultry waste as well as other contaminants such as drug residues, pathogenic organisms, and viruses (like avian influenza) could be eliminated via nutritional and management interventions, and attention in the media has increased greatly (media@environmentaldefense.org). Soil, water, and air pollution, and transmitted diseases have been reported worldwide and methods of controlling them have been discussed in the literature. Nutrient concentrations, dietary manipulation, and waste management may play an important role in these areas. Biotechnology may offer interesting tools for improving nutrient utilization and eliminating nutrient waste, while protecting the environment from excess pollutants, including animal wastes. On the ...

Research paper thumbnail of Magnetized drinking water improves productivity and blood parameters in geese

Revista Colombiana de Ciencias Pecuarias, 2017

Magnetized drinking water improves productivity and blood parameters in geese ¤ El agua de bebida... more Magnetized drinking water improves productivity and blood parameters in geese ¤ El agua de bebida magnetizada mejora la productividad y los parámetros sanguíneos en gansos A água magnetizada melhora a produtividade e os parâmetros sanguíneos em gansos

Research paper thumbnail of Growth performance, digestibility, intestinal morphology, Carcass traits and meat quality of broilers fed marginal nutrients deficiency-diet supplemented with different levels of active Yeast

Livestock Science, 2020

A total of 216 one-day-old Arbor Acres broiler chicks were randomly distributed among 36 cages of... more A total of 216 one-day-old Arbor Acres broiler chicks were randomly distributed among 36 cages of 6 replicates per treatment and 6 birds per cage during 1-38 d of age. A factorial design (2 × 3) was used in which there were two feed rations [standard diet vs. marginal nutrients deficiency-diet (MNDD)] and three Saccharomyces cerevisiae (SC, active yeast) concentrations (0, 0.02 and 0.04%). The results showed that marginal nutrients deficiency-diet significantly decreased growth rate and production index during the experimental period and this accounted for 5.4% for the whole period. The MNDD impaired feed conversion ratio (FCR) during 1-21 d of age, but FCR for the whole period was not affected. Addition of SC at 0.04% significantly improved growth rate and increased organic matter digestibility and apparent ash retention, compared to 0.02% diet. Addition of SC had a significant effect on percentage of gastrointestinal tract and length of villi. Dressing percentage was significantly higher for the group fed on MNDD than those on the standard diet. The increase in the dressing percentage was associated with significantly higher gizzard, gut percentage and length of the intestine. The type of diet, the SC concentration, and the interaction between them had no significant effects on the chemical composition and the physical characteristics of the meat. It could be concluded that SC supplementation to standard-or MNDD improved growth performance of broiler chickens. Hence, feeding MNDD supplemented with either 0.02 or 0.04% SC showed higher growth performance than the standard diet without SC supplementation.

Research paper thumbnail of Nutrients profile, protein quality and energy value of whole Prosopis pods meal as a feedstuff for poultry feeding

Italian Journal of Animal Science, 2018

The chemical composition, tannins level, mineral profile, fatty acids profile and amino acids pro... more The chemical composition, tannins level, mineral profile, fatty acids profile and amino acids profile of whole Prosopis pods meal (WPPM) were determined. In addition, apparent energy metabolisability (AEM) and true energy metabolisability (TEM) and apparent (AAAD) and true (TAAD) amino acids digestibility were determined via a precision-feeding assay. Protein quality was also determined via a total protein efficiency assay. The tannins content of WPPM was 42.8 mg/g dry matter. WPPM showed 15.2% crude protein, 2.61% ether extract, 18.58% crude fibre and 6.04% ash, with 5.44 and 7.57 MJ/kg AEM and TEM, respectively. The WPPM contained 0.66% Ca, 0.20% P, 764 ppm Fe, 69.4 ppm Zn, 33.9 ppm Mn, 36.1 ppm Cu, 21.7 ppm Cr, 7.4 ppm Cd, 9.8 ppm Ni and 28.2 ppm Pb. The WPPM showed 92.54% total fatty acids, of which 25.33% were saturated fatty acids and 67.21% unsaturated fatty acids; of the latter, 37.83% were monounsaturated and 29.37% polyunsaturated. Threonine, valine, methionine, isoleucine, leucine, phenylalanine, histidine, lysine, arginine and tryptophan levels were 0.47, 0.67, 0.12, 0.54, 1.03, 0.40, 0.20, 0.46, 0.67 and 0.44%, respectively. Therefore, WPPM can meet 1.08% of the total amino acids requirements of broiler chickens from 1 to 21 days of age. The AAAD and TAAD of the WPPM were 34.9 and 65.0%, respectively. The protein quality of WPPM was 23.4% lower than that of soybean meal. In conclusion, WPPM contains a considerable amount of energy and nutrients (protein, minerals, fatty acids and amino acids), but its protein quality is lower than that of soybean meal.

Research paper thumbnail of Soya lecithin and season affect the productive performance, nutrient digestibility, and blood constituents of growing rabbits

Journal of Animal and Feed Sciences, 2018

Research paper thumbnail of Bee pollen and propolis as dietary supplements for rabbit: Effect on reproductive performance of does and on immunological response of does and their offspring

Journal of Animal Physiology and Animal Nutrition, 2019

To evaluate the effect of bee pollen (BP) and/or propolis (Pro) supplementation on rabbit does, 6... more To evaluate the effect of bee pollen (BP) and/or propolis (Pro) supplementation on rabbit does, 64 nulliparous NZW rabbits does were distributed among eight groups (eight animals/group). One unsupplemented group was the control; the other seven groups were supplemented, respectively, with zinc bacitracin (ZnB) at 100 mg, BP at 150 and 300 mg, Pro at 150 and 300 mg, BP+Pro at 150 and 300 mg of each three times/week, day after day continuously along eight parities. The BP300, Pro300 and BP+Pro150 groups had higher body weight of litter at birth and number of kids born alive. The BP supplementation at 150 mg increased plasma total protein and albumin than the control group. The BP or Pro at 150 mg decreased plasma T3 than the other groups except for BP+Pro150. The ZnB group had significantly greater T3/T4 ratio compared to BP, Pro and BP+Pro at 150 mg. The BP+Pro150 group had less ALT than the control; BP300 and Pro 300 mg resulted in lower plasma AST than the groups Pro150 with or wit...

Research paper thumbnail of Productive and reproductive performance of rabbits does as affected by bee pollen and/or propolis, inulin and/or mannan-oligosaccharides

World Rabbit Science, 2015

The aim of the paper was to compare the effect of prebiotics (inulin and/or mannan-oligosaccharid... more The aim of the paper was to compare the effect of prebiotics (inulin and/or mannan-oligosaccharides, MOS) and bee products (bee pollen and/or propolis) on productive and reproductive performance of rabbit does. Seventy nulliparous V-line female rabbits were distributed among 7 groups. The groups were fed the same diet and received no supplements (control group), natural molecules (bee pollen and/or propolis) at 200 mg/kg body weight (BW) or prebiotics (inulin and/or MOS) at 35 mg/kg BW. Productive, reproductive, biochemical and haematological traits were investigated. Bee pollen with propolis significantly increased body weight gain of does 1 wk after mating (3.53%), decreased feed intake (4.49%) and caused larger litter size (39.4%), heavier body weight of litter (17.7%), a greater number of kits born alive (48.7%), higher weight of kits (87.81%) at 28 d of age, higher milk yield (43.6%) and more favourable milk conversion ratio (31.6%). Moreover, bee pollen with propolis had signi...

Research paper thumbnail of Daily Energy Allotments and Performance of Broiler Breeders

Poultry Science, 1995

The effects of daily energy intake on reproductive performance of Arbor Acres males and on growth... more The effects of daily energy intake on reproductive performance of Arbor Acres males and on growth of their offspring was studied. In Experiment 1, 21 males were placed in individual pens with 12 females. Three rations, differing in energy, were fed from 24 to 57 wk of age with seven males receiving either 300, 340, or 380 kcal ME/d. In Experiment 2, 32 individually caged males were given daily allotments of 280, 320, 360, or 360 kcal ME/d from 26 to 32 wk of age and 300, 340, 380, or 380 kcal ME/d from 32 to 38 wk. Rations of the two groups of males fed the highest energy level differed in formulation, one being the same wheat short-based basal ration as fed to the two lower energy groups, only with additional fat, and the other being a corn-soybean-based ration. Body weight and testes weight were increased with increased energy allotment in both experiments but carcass composition was unaltered. There were no significant effects of energy intake on fertility or hatchability in either experiment. Even though mean differences were not significant, fertility in two pens dropped to near zero at 38 wk in Experiment 1. Semen characteristics and plasma testosterone concentrations were unaffected by energy intake in Experiment 2. There was a significant linear increase in 6-wk BW of broilers associated with the increase in sire energy intake in each of three batches of broilers grown in Experiment 1 and in one of two batches of broilers grown in Experiment 2.

Research paper thumbnail of Daily Energy Allotment and Reproductive Performance of Broiler Breeder Males

Poultry Science, 1993

Abstract Ross broiler breeder males, housed in floor pens with females and fed from separate feed... more Abstract Ross broiler breeder males, housed in floor pens with females and fed from separate feeders, were given 125 g/day of isonitrogenous diets formulated to provide 300, 340, and 380 kcal per male per day between 28 and 60 wk of age. Males given 300 kcal/day maintained their initial BW and were consistently lighter than those fed the two higher energy levels; BW of males given the two higher energy allotments did not differ from each other. Fertility levels, over the whole experiment, averaged 80.1, 91.1, and 83.0% for the low-, intermediate-, and high-energy groups, respectively. Fertility dropped slightly over time in all groups but showed a precipitous fall in the low-energy group between 48 and 60 wk. Hatchability of fertile eggs showed a significant decrease over time but no treatment differences were found. Hatchability of eggs set, like fertility, showed a significant quadratic regression on energy allocation. A significant linear effect of energy level on 60-wk testes weights was found but carcass composition at 60 wk was unrelated to dietary energy allocation. Males fed 300 kcal/day had less severe pododermatitis than males in other groups, but the correlation between BW and pododermatitis score was not significant. Average 6-wk BW of approximately 500 offspring of males fed the low-energy diet, raised comingled with those from other male treatments in three separate growth trials, were consistently and significantly lower than those of offspring of males fed 380 kcal/day.

Research paper thumbnail of Enhanced separation of pyrite from oxidized coal by froth flotation using biosurface modification

International Journal of Mineral Processing, 1993

... Vaaler, LE and Attia, YA, 1983. Microbial modification of mineral surfaces to change flotatio... more ... Vaaler, LE and Attia, YA, 1983. Microbial modification of mineral surfaces to change flotation characteristics. In: Report of Invention, Battelle-Columbus Laboratories, Columbus, OH. Corresponding Author Contact Information Corresponding author. ...