Andréia Massuquetto - Academia.edu (original) (raw)
Papers by Andréia Massuquetto
Archives of Veterinary Science, 2017
Livestock Science, 2021
Abstract An experiment was conducted to investigate the effect of soybean meal (SBM) with differe... more Abstract An experiment was conducted to investigate the effect of soybean meal (SBM) with different particle sizes included in mash diets on digestible energy, nutrient digestibility, and growth performance of broiler chickens. A total of 720 one-d-old male broiler chickens were assigned to 4 treatments with 9 replicates of 20 broiler chickens each in a completely randomized design and reared from d 0 to 42. The treatments consisted of the dietary inclusion of SBM with different particle sizes of 625, 775, 1,053, and 1,406 μm. Coefficients of apparent ileal digestibility, growth performance variables, and carcass yield, and relative yield of parts were evaluated. The SBM particle size had a quadratic effect on crude protein digestibility and ileal digestible energy (P
Poultry Science, 2021
Starch is the main energy source in broiler diets. However, endogenous amylase secretion in young... more Starch is the main energy source in broiler diets. However, endogenous amylase secretion in young broilers is suboptimal to completely digest dietary starch, so exogenous α-amylase supplementation may help increase starch digestibility. The objective of this study was to assess the supplementation of increasing doses of an exogenous α-amylase (0, 40, 80, 120, and 160 kilo-novo α-amylase units (KNU)/kg) on corn and on a complete corn–soybean meal diet for 25-day-old broilers. Jejunal and ileal apparent digestibility coefficients of available starch, resistant starch, total starch, and DM, DM total tract retention, as well as dietary AME levels were evaluated. Interactions (P < 0.05) between diets and α-amylase showed that the enzyme had a more evident effect on increasing DM jejunal digestibility and AME on corn compared with the complete diet. Corn DM digestibility increased to a maximum of 67.84% with up to 47 KNU/kg, whereas 89 KNU/kg led to a maximum of 53.92% in the complete diet A maximum increase of 64 kcal AME/kg was obtained with 80 KNU/kg on the complete diet, whereas 109 KNU/kg generated 327 kcal AME/kg on corn (P < 0.05). Increasing the α-amylase dose linearly increased ileal digestibility of resistant starch (P < 0.05), and the effect on DM total tract retention was quadratic (P < 0.05). Corn showed a higher digestibility for DM, resistant and total starch, as well as DM total tract retention and AME, compared with the complete diet (P < 0.05). Treatments had no influence on available starch. The inclusion of exogenous α-amylase improves starch, DM, and energy utilization of corn-based and corn–soybean meal–based diets for broilers.
Journal of Applied Poultry Research, 2019
SUMMARY Pelleting is the most common heat processing method used in the poultry feed industry and... more SUMMARY Pelleting is the most common heat processing method used in the poultry feed industry and the quality of feed processing directly impacts the efficiency of the utilization of feedstuffs by broilers, and consequently, their performance. The objective of this experiment was to evaluate the influence of conditioning temperature on pellet physical quality, and on the apparent ileal digestibility coefficients of dry matter (CIADDM), crude protein (CIADCP) and starch (CIADstarch), coefficient of apparent metabolizability of dry matter (CAMDM), and the apparent metabolizable energy content (AME) of the diets. The live performance of broilers (feed intake, FI; weight gain, WG; and feed conversion ratio, FCR) was evaluated. Treatments consisted of a mash diet and pelleted/crumbled corn-soybean meal based diets submitted to different conditioning temperatures (no conditioning or conditioned at 60, 70, 80, and 90°C). Feed was steam-conditioned for 15 s at a 1.5 kgf/cm2 for all pelleted...
Resumo: A peletização de rações é o processamento térmico mais utilizado na indústria avícola. Fr... more Resumo: A peletização de rações é o processamento térmico mais utilizado na indústria avícola. Frangos de corte alimentados com dietas peletizadas apresentam maior desempenho zootécnico e maior digestibilidade de diferentes frações da dieta. Além disso, aves têm preferência por dietas peletizadas, o que favorece o consumo de ração. No entanto, estes benefícios são atingidos se houver produção de peletes de boa qualidade capazes de manter sua integridade até o momento do consumo pelas aves. O presente trabalho teve por objetivo avaliar o efeito de dietas com diferentes formas físicas e do tempo de condicionamento de dietas peletizadas sobre o desempenho, digestibilidade de nutrientes e da energia, e preferência alimentar de frangos de corte de 1 a 21 dias. Ainda, se avaliou a qualidade física dos peletes, solubilidade da proteína em KOH e grau de gelatinização do amido das rações processadas. No primeiro experimento foram utilizados 480 pintos machos Cobb distribuídos em delineamento...
Animal, 2020
Feed form is well recognized to improve broiler performance, specially by increasing feed intake ... more Feed form is well recognized to improve broiler performance, specially by increasing feed intake (FI). However, when different diet energy levels are used, the results differ in the literature. Therefore, this experiment was conducted to evaluate the influence of feed form and dietary metabolizable energy (ME) levels on broiler performance, carcass yield and on the digestibility of DM, CP, starch and gross energy. In total, 1152 male Cobb 500 broilers were evaluated between 35 and 47 days. The birds were distributed according to a completely randomized design in a 2 × 4 factorial arrangement, consisting of two feed forms (mash or pellet) and four ME levels (12.73, 13.06, 13.40 or 13.73 MJ/kg), totaling eight treatments with eight replicates of 18 birds. Broilers fed the lowest ME level presented the lowest weight gain (WG) and worst feed per unit gain (P < 0.01). Metabolizable energy intake increased (P < 0.01) with progressive increments of ME, which, however, did not affect ...
The objective of this study was to analyze the physical-chemical characteristics of corn lots wit... more The objective of this study was to analyze the physical-chemical characteristics of corn lots with different ratios of damaged to intact grains, considering the interaction between them. Recently harvested corn grains were selected, and grains attacked by fungi (fermented and moldy) and intact grains were separated to establish the following grain mixtures (treatments): 1 – 0% fermented/moldy and 100% intact grains; 2 - 10% fermented/moldy and 90% intact grains; 3 - 20% fermented/moldy and 80% intact grains; 4 - 30% fermented/moldy and 70% intact grains; and 5 - 40% fermented/moldy and 60% intact grains. Samples from each treatment were analyzed for dry matter (DM), ash (A), crude protein (CP), crude fiber (CF), ether extract (EE), and gross energy (GE) contents, water activity (aw), density, and hardness. Chemical composition and density data were submitted to analysis of regression, hardness values were compared by Tukey test (P<0.05), and Pearson’s correlations (P<0.05) bet...
RESUMO: O objetivo foi avaliar o efeito da equalização de consumo e da peletização sobre a digest... more RESUMO: O objetivo foi avaliar o efeito da equalização de consumo e da peletização sobre a digestibilidade de frações da dieta e energia em frangos de corte. Foram utilizados 96 pintos machos distribuídos em delineamento inteiramente casualizado com seis tratamentos e oito repetições de duas aves cada. Os tratamentos consistiram de dieta farelada fornecida à vontade (controle), peletizada à vontade, ou fornecidas de acordo com diferentes programas alimentares (100, 95, 90 e 85% da quantidade consumida pelo controle). Aos 35 dias de idade, todas as aves foram eutanasiadas para coleta de conteúdo ileal para determinação do coeficiente de digestibilidade ileal aparente da matéria seca (MS), proteína bruta (PB) e energia digestível ileal (EDI). A digestibilidade da MS e EDI foram melhores em aves receberam 85 e 90% do total consumido pelo tratamento controle (P<0,01). A digestibilidade da PB foi otimizada nas aves que consumiram 85%. Entre as dietas peletizadas, a digestibilidade da MS respondeu de forma quadrática (P<0,01) ao passo que a digestibilidade da PB e o valor de EDI aumentaram linearmente quando se restringiu o consumo de ração (P<0,01). A quantidade de ração peletizada consumida pelas aves afeta a digestibilidade de frações da dieta e da energia. PALAVRAS-CHAVE: aves, consumo, peletes, pair-feeding, processamento térmico ABSTRACT: The aim of this study was to evaluate the effect of feed equalization and pelleting on digestibility of nutrients and energy in broilers. We used 96 male broiler chicks in a completely randomized design with six treatments and eight replicates of two birds each. Treatments consisted of mash diet provided ad libitum (control), pelleted ad libitum, or provided according to different feed programs (100, 95, 90 and 85% of the feed intake of control). At 35 days of age, all the birds were euthanized to collect ileal content to estimate the apparent ileal digestibility of dry matter (DM), crude protein (CP) and ileal digestible energy (IDE). The digestibility of DM and IDE were better than control in birds fed 85 and 90% of mash feed intake (P<0.01). However protein digestibility was improved when the birds consumed 85%. Among the pelleted diets, the digestibility of DM were quadratic (P<0.01) whereas the digestibility of CP and IDE value increased linearly with feed restriction (P<0,01). The amount of pelleted feed consumed by birds affects the digestibility of nutrients and energy.
Poultry Science, 2019
This experiment was conducted to study the effect of different feeding programs and pelleting on ... more This experiment was conducted to study the effect of different feeding programs and pelleting on performance, nutrient digestibility, ileal digestible energy (IDE); and carcass yield of broilers from 21 to 35 d of age. In total, 768 male broilers were distributed according to a completely randomized design with 6 treatments and 8 replicates of 16 birds each. The treatments were mash and pelleted diets provided ad libitum, or pelleted and supplied at the same rate (100%) or restricted at 95, 90, and 85% (P100, P95, P90, and P85) of the amount consumed by the birds fed mash diet ad libitum. When supplied ad libitum, the pelleted diet had the highest feed intake and weight gain (WG), better feed conversion ratio (FCR), better feed conversion adjusted for 2.3 kg (AdjFCR, P < 0.001) and caloric conversion (P < 0.001); and higher amount of abdominal fat (P < 0.001) when compared to the control (mash ad libitum). However, there were no effects on nutrient digestibility (P > 0.0...
Archives of Veterinary Science
O objetivo foi avaliar a adição de simbiótico em rações para leitões na fase de creche com desafi... more O objetivo foi avaliar a adição de simbiótico em rações para leitões na fase de creche com desafio nutricional. Foram utilizados 84 leitões, machos, castrados, em arranjo fatorial 2x2 (Dieta e Simbiótico), com 7 repetições e 3 animais por repetição. Tratamentos: DAD (dieta de alta digestibilidade), DBD (dieta de baixa digestibilidade), DAD+S (dieta de alta digestibilidade com simbiótico) e DBD+S (dieta de baixa digestibilidade com simbiótico). Variáveis estudas: ganho de peso diário (GPD), consumo médio de ração (CMR), conversão alimentar (CA) e frequência de fezes. Os parâmetros de desempenho foram comparados com o teste de Dunnett; considerando como controles a DAD e ausência de simbiótico. Para efeito da dieta, não foi observado diferença dos 21 aos 42 dias de idade, no entanto a DBD resultou em menor GPD (P<0,1) dos 42 aos 63 e menor CMR e GPD no período total (P<0,1). Por outro lado, a adição do simbiótico piorou (P<0,1) o CMR e o GPD dos 21 aos 42, o GPD e a CA dos 42...
Abstract An experiment was conducted to investigate the effects of the feed form and conditioning... more Abstract An experiment was conducted to investigate the effects of the feed form and conditioning time of pelleted diets on pellet quality, broiler performance and nutrient digestibility during the starter phase. A total of 480 male Cobb broilers were distributed according to a completely randomized experimental design into six treatments with eight replicates each. Treatments consisted of a mash diet and five crumbled diets submitted to different conditioning times (zero, 60, 80, 100, or 120 seconds). The broilers fed pelleted diets submitted to steam conditioning presented higher feed intake and BW gain (P ≤ 0.05), higher coefficient of ileal apparent digestibility (CIAD) of DM and CP, as well as higher ileal digestible energy (IDE) (P ≤ 0.05) than those fed the mash diet. However, treatments did not influence FCR or starch digestibility (P > 0.05). Feed intake increased linearly (P ≤ 0.05) with conditioning time while a quadratic response (P ≤ 0.05) was noted for IDE. Conditioning time did not affect the amount of intact pellets or protein solubility (P > 0.05), but increased pellet durability index (P ≤ 0.01), pellet hardness (P ≤ 0.05), and water activity (P ≤ 0.05). It was concluded that feed physical form and conditioning time influence the performance and nutrient digestibility in starter broilers. and that increasing conditioning times promote better pellet quality.
Journal of Agricultural Science and Technology A, 2015
Pelleting is the most popular thermal processing technique in poultry industry. Birds fed pellete... more Pelleting is the most popular thermal processing technique in poultry industry. Birds fed pelleted diets have greater feed intake and weight gain, and better feed conversion ratio. However, this better performance can only be achieved, if the pellets remain intact until they are ingested by the birds. Many factors may affect pellet physical quality, such as feed nutritional composition, ingredient particle size, conditioning temperature and time, feed moisture, etc.. Despite their importance, sometimes these factors are not managed properly, therefore, pelleted feed may not contain a high amount of intact pellets. In addition, the possible interactions among these variables may yield different responses in comparison with those expected when individual factors are considered. Very few experiments have been conducted to evaluate the impact of combined factors on pellet quality. This may be explained by the presence of many qualitative and quantitative factors in the manufacturing process. Research indicates that heat processing and feed formulation, especially fat inclusion level, are the factors which have the biggest influence on pellet quality. Strategies, such as the expansion process and fat inclusion restriction or post pellet liquid fat application could be implemented to produce high physical quality pellets. More research is needed to identify which factors have a positive or negative effect on pelleting process and to find new strategies to improve pellet physical quality.
Journal of Agricultural Science and Technology A, 2015
Pelleting is the most popular thermal processing technique in poultry industry. Birds fed pellete... more Pelleting is the most popular thermal processing technique in poultry industry. Birds fed pelleted diets have greater feed intake and weight gain, and better feed conversion ratio. However, this better performance can only be achieved, if the pellets remain intact until they are ingested by the birds. Many factors may affect pellet physical quality, such as feed nutritional composition, ingredient particle size, conditioning temperature and time, feed moisture, etc.. Despite their importance, sometimes these factors are not managed properly, therefore, pelleted feed may not contain a high amount of intact pellets. In addition, the possible interactions among these variables may yield different responses in comparison with those expected when individual factors are considered. Very few experiments have been conducted to evaluate the impact of combined factors on pellet quality. This may be explained by the presence of many qualitative and quantitative factors in the manufacturing process. Research indicates that heat processing and feed formulation, especially fat inclusion level, are the factors which have the biggest influence on pellet quality. Strategies, such as the expansion process and fat inclusion restriction or post pellet liquid fat application could be implemented to produce high physical quality pellets. More research is needed to identify which factors have a positive or negative effect on pelleting process and to find new strategies to improve pellet physical quality.
Archives of Veterinary Science, 2017
Livestock Science, 2021
Abstract An experiment was conducted to investigate the effect of soybean meal (SBM) with differe... more Abstract An experiment was conducted to investigate the effect of soybean meal (SBM) with different particle sizes included in mash diets on digestible energy, nutrient digestibility, and growth performance of broiler chickens. A total of 720 one-d-old male broiler chickens were assigned to 4 treatments with 9 replicates of 20 broiler chickens each in a completely randomized design and reared from d 0 to 42. The treatments consisted of the dietary inclusion of SBM with different particle sizes of 625, 775, 1,053, and 1,406 μm. Coefficients of apparent ileal digestibility, growth performance variables, and carcass yield, and relative yield of parts were evaluated. The SBM particle size had a quadratic effect on crude protein digestibility and ileal digestible energy (P
Poultry Science, 2021
Starch is the main energy source in broiler diets. However, endogenous amylase secretion in young... more Starch is the main energy source in broiler diets. However, endogenous amylase secretion in young broilers is suboptimal to completely digest dietary starch, so exogenous α-amylase supplementation may help increase starch digestibility. The objective of this study was to assess the supplementation of increasing doses of an exogenous α-amylase (0, 40, 80, 120, and 160 kilo-novo α-amylase units (KNU)/kg) on corn and on a complete corn–soybean meal diet for 25-day-old broilers. Jejunal and ileal apparent digestibility coefficients of available starch, resistant starch, total starch, and DM, DM total tract retention, as well as dietary AME levels were evaluated. Interactions (P < 0.05) between diets and α-amylase showed that the enzyme had a more evident effect on increasing DM jejunal digestibility and AME on corn compared with the complete diet. Corn DM digestibility increased to a maximum of 67.84% with up to 47 KNU/kg, whereas 89 KNU/kg led to a maximum of 53.92% in the complete diet A maximum increase of 64 kcal AME/kg was obtained with 80 KNU/kg on the complete diet, whereas 109 KNU/kg generated 327 kcal AME/kg on corn (P < 0.05). Increasing the α-amylase dose linearly increased ileal digestibility of resistant starch (P < 0.05), and the effect on DM total tract retention was quadratic (P < 0.05). Corn showed a higher digestibility for DM, resistant and total starch, as well as DM total tract retention and AME, compared with the complete diet (P < 0.05). Treatments had no influence on available starch. The inclusion of exogenous α-amylase improves starch, DM, and energy utilization of corn-based and corn–soybean meal–based diets for broilers.
Journal of Applied Poultry Research, 2019
SUMMARY Pelleting is the most common heat processing method used in the poultry feed industry and... more SUMMARY Pelleting is the most common heat processing method used in the poultry feed industry and the quality of feed processing directly impacts the efficiency of the utilization of feedstuffs by broilers, and consequently, their performance. The objective of this experiment was to evaluate the influence of conditioning temperature on pellet physical quality, and on the apparent ileal digestibility coefficients of dry matter (CIADDM), crude protein (CIADCP) and starch (CIADstarch), coefficient of apparent metabolizability of dry matter (CAMDM), and the apparent metabolizable energy content (AME) of the diets. The live performance of broilers (feed intake, FI; weight gain, WG; and feed conversion ratio, FCR) was evaluated. Treatments consisted of a mash diet and pelleted/crumbled corn-soybean meal based diets submitted to different conditioning temperatures (no conditioning or conditioned at 60, 70, 80, and 90°C). Feed was steam-conditioned for 15 s at a 1.5 kgf/cm2 for all pelleted...
Resumo: A peletização de rações é o processamento térmico mais utilizado na indústria avícola. Fr... more Resumo: A peletização de rações é o processamento térmico mais utilizado na indústria avícola. Frangos de corte alimentados com dietas peletizadas apresentam maior desempenho zootécnico e maior digestibilidade de diferentes frações da dieta. Além disso, aves têm preferência por dietas peletizadas, o que favorece o consumo de ração. No entanto, estes benefícios são atingidos se houver produção de peletes de boa qualidade capazes de manter sua integridade até o momento do consumo pelas aves. O presente trabalho teve por objetivo avaliar o efeito de dietas com diferentes formas físicas e do tempo de condicionamento de dietas peletizadas sobre o desempenho, digestibilidade de nutrientes e da energia, e preferência alimentar de frangos de corte de 1 a 21 dias. Ainda, se avaliou a qualidade física dos peletes, solubilidade da proteína em KOH e grau de gelatinização do amido das rações processadas. No primeiro experimento foram utilizados 480 pintos machos Cobb distribuídos em delineamento...
Animal, 2020
Feed form is well recognized to improve broiler performance, specially by increasing feed intake ... more Feed form is well recognized to improve broiler performance, specially by increasing feed intake (FI). However, when different diet energy levels are used, the results differ in the literature. Therefore, this experiment was conducted to evaluate the influence of feed form and dietary metabolizable energy (ME) levels on broiler performance, carcass yield and on the digestibility of DM, CP, starch and gross energy. In total, 1152 male Cobb 500 broilers were evaluated between 35 and 47 days. The birds were distributed according to a completely randomized design in a 2 × 4 factorial arrangement, consisting of two feed forms (mash or pellet) and four ME levels (12.73, 13.06, 13.40 or 13.73 MJ/kg), totaling eight treatments with eight replicates of 18 birds. Broilers fed the lowest ME level presented the lowest weight gain (WG) and worst feed per unit gain (P < 0.01). Metabolizable energy intake increased (P < 0.01) with progressive increments of ME, which, however, did not affect ...
The objective of this study was to analyze the physical-chemical characteristics of corn lots wit... more The objective of this study was to analyze the physical-chemical characteristics of corn lots with different ratios of damaged to intact grains, considering the interaction between them. Recently harvested corn grains were selected, and grains attacked by fungi (fermented and moldy) and intact grains were separated to establish the following grain mixtures (treatments): 1 – 0% fermented/moldy and 100% intact grains; 2 - 10% fermented/moldy and 90% intact grains; 3 - 20% fermented/moldy and 80% intact grains; 4 - 30% fermented/moldy and 70% intact grains; and 5 - 40% fermented/moldy and 60% intact grains. Samples from each treatment were analyzed for dry matter (DM), ash (A), crude protein (CP), crude fiber (CF), ether extract (EE), and gross energy (GE) contents, water activity (aw), density, and hardness. Chemical composition and density data were submitted to analysis of regression, hardness values were compared by Tukey test (P<0.05), and Pearson’s correlations (P<0.05) bet...
RESUMO: O objetivo foi avaliar o efeito da equalização de consumo e da peletização sobre a digest... more RESUMO: O objetivo foi avaliar o efeito da equalização de consumo e da peletização sobre a digestibilidade de frações da dieta e energia em frangos de corte. Foram utilizados 96 pintos machos distribuídos em delineamento inteiramente casualizado com seis tratamentos e oito repetições de duas aves cada. Os tratamentos consistiram de dieta farelada fornecida à vontade (controle), peletizada à vontade, ou fornecidas de acordo com diferentes programas alimentares (100, 95, 90 e 85% da quantidade consumida pelo controle). Aos 35 dias de idade, todas as aves foram eutanasiadas para coleta de conteúdo ileal para determinação do coeficiente de digestibilidade ileal aparente da matéria seca (MS), proteína bruta (PB) e energia digestível ileal (EDI). A digestibilidade da MS e EDI foram melhores em aves receberam 85 e 90% do total consumido pelo tratamento controle (P<0,01). A digestibilidade da PB foi otimizada nas aves que consumiram 85%. Entre as dietas peletizadas, a digestibilidade da MS respondeu de forma quadrática (P<0,01) ao passo que a digestibilidade da PB e o valor de EDI aumentaram linearmente quando se restringiu o consumo de ração (P<0,01). A quantidade de ração peletizada consumida pelas aves afeta a digestibilidade de frações da dieta e da energia. PALAVRAS-CHAVE: aves, consumo, peletes, pair-feeding, processamento térmico ABSTRACT: The aim of this study was to evaluate the effect of feed equalization and pelleting on digestibility of nutrients and energy in broilers. We used 96 male broiler chicks in a completely randomized design with six treatments and eight replicates of two birds each. Treatments consisted of mash diet provided ad libitum (control), pelleted ad libitum, or provided according to different feed programs (100, 95, 90 and 85% of the feed intake of control). At 35 days of age, all the birds were euthanized to collect ileal content to estimate the apparent ileal digestibility of dry matter (DM), crude protein (CP) and ileal digestible energy (IDE). The digestibility of DM and IDE were better than control in birds fed 85 and 90% of mash feed intake (P<0.01). However protein digestibility was improved when the birds consumed 85%. Among the pelleted diets, the digestibility of DM were quadratic (P<0.01) whereas the digestibility of CP and IDE value increased linearly with feed restriction (P<0,01). The amount of pelleted feed consumed by birds affects the digestibility of nutrients and energy.
Poultry Science, 2019
This experiment was conducted to study the effect of different feeding programs and pelleting on ... more This experiment was conducted to study the effect of different feeding programs and pelleting on performance, nutrient digestibility, ileal digestible energy (IDE); and carcass yield of broilers from 21 to 35 d of age. In total, 768 male broilers were distributed according to a completely randomized design with 6 treatments and 8 replicates of 16 birds each. The treatments were mash and pelleted diets provided ad libitum, or pelleted and supplied at the same rate (100%) or restricted at 95, 90, and 85% (P100, P95, P90, and P85) of the amount consumed by the birds fed mash diet ad libitum. When supplied ad libitum, the pelleted diet had the highest feed intake and weight gain (WG), better feed conversion ratio (FCR), better feed conversion adjusted for 2.3 kg (AdjFCR, P < 0.001) and caloric conversion (P < 0.001); and higher amount of abdominal fat (P < 0.001) when compared to the control (mash ad libitum). However, there were no effects on nutrient digestibility (P > 0.0...
Archives of Veterinary Science
O objetivo foi avaliar a adição de simbiótico em rações para leitões na fase de creche com desafi... more O objetivo foi avaliar a adição de simbiótico em rações para leitões na fase de creche com desafio nutricional. Foram utilizados 84 leitões, machos, castrados, em arranjo fatorial 2x2 (Dieta e Simbiótico), com 7 repetições e 3 animais por repetição. Tratamentos: DAD (dieta de alta digestibilidade), DBD (dieta de baixa digestibilidade), DAD+S (dieta de alta digestibilidade com simbiótico) e DBD+S (dieta de baixa digestibilidade com simbiótico). Variáveis estudas: ganho de peso diário (GPD), consumo médio de ração (CMR), conversão alimentar (CA) e frequência de fezes. Os parâmetros de desempenho foram comparados com o teste de Dunnett; considerando como controles a DAD e ausência de simbiótico. Para efeito da dieta, não foi observado diferença dos 21 aos 42 dias de idade, no entanto a DBD resultou em menor GPD (P<0,1) dos 42 aos 63 e menor CMR e GPD no período total (P<0,1). Por outro lado, a adição do simbiótico piorou (P<0,1) o CMR e o GPD dos 21 aos 42, o GPD e a CA dos 42...
Abstract An experiment was conducted to investigate the effects of the feed form and conditioning... more Abstract An experiment was conducted to investigate the effects of the feed form and conditioning time of pelleted diets on pellet quality, broiler performance and nutrient digestibility during the starter phase. A total of 480 male Cobb broilers were distributed according to a completely randomized experimental design into six treatments with eight replicates each. Treatments consisted of a mash diet and five crumbled diets submitted to different conditioning times (zero, 60, 80, 100, or 120 seconds). The broilers fed pelleted diets submitted to steam conditioning presented higher feed intake and BW gain (P ≤ 0.05), higher coefficient of ileal apparent digestibility (CIAD) of DM and CP, as well as higher ileal digestible energy (IDE) (P ≤ 0.05) than those fed the mash diet. However, treatments did not influence FCR or starch digestibility (P > 0.05). Feed intake increased linearly (P ≤ 0.05) with conditioning time while a quadratic response (P ≤ 0.05) was noted for IDE. Conditioning time did not affect the amount of intact pellets or protein solubility (P > 0.05), but increased pellet durability index (P ≤ 0.01), pellet hardness (P ≤ 0.05), and water activity (P ≤ 0.05). It was concluded that feed physical form and conditioning time influence the performance and nutrient digestibility in starter broilers. and that increasing conditioning times promote better pellet quality.
Journal of Agricultural Science and Technology A, 2015
Pelleting is the most popular thermal processing technique in poultry industry. Birds fed pellete... more Pelleting is the most popular thermal processing technique in poultry industry. Birds fed pelleted diets have greater feed intake and weight gain, and better feed conversion ratio. However, this better performance can only be achieved, if the pellets remain intact until they are ingested by the birds. Many factors may affect pellet physical quality, such as feed nutritional composition, ingredient particle size, conditioning temperature and time, feed moisture, etc.. Despite their importance, sometimes these factors are not managed properly, therefore, pelleted feed may not contain a high amount of intact pellets. In addition, the possible interactions among these variables may yield different responses in comparison with those expected when individual factors are considered. Very few experiments have been conducted to evaluate the impact of combined factors on pellet quality. This may be explained by the presence of many qualitative and quantitative factors in the manufacturing process. Research indicates that heat processing and feed formulation, especially fat inclusion level, are the factors which have the biggest influence on pellet quality. Strategies, such as the expansion process and fat inclusion restriction or post pellet liquid fat application could be implemented to produce high physical quality pellets. More research is needed to identify which factors have a positive or negative effect on pelleting process and to find new strategies to improve pellet physical quality.
Journal of Agricultural Science and Technology A, 2015
Pelleting is the most popular thermal processing technique in poultry industry. Birds fed pellete... more Pelleting is the most popular thermal processing technique in poultry industry. Birds fed pelleted diets have greater feed intake and weight gain, and better feed conversion ratio. However, this better performance can only be achieved, if the pellets remain intact until they are ingested by the birds. Many factors may affect pellet physical quality, such as feed nutritional composition, ingredient particle size, conditioning temperature and time, feed moisture, etc.. Despite their importance, sometimes these factors are not managed properly, therefore, pelleted feed may not contain a high amount of intact pellets. In addition, the possible interactions among these variables may yield different responses in comparison with those expected when individual factors are considered. Very few experiments have been conducted to evaluate the impact of combined factors on pellet quality. This may be explained by the presence of many qualitative and quantitative factors in the manufacturing process. Research indicates that heat processing and feed formulation, especially fat inclusion level, are the factors which have the biggest influence on pellet quality. Strategies, such as the expansion process and fat inclusion restriction or post pellet liquid fat application could be implemented to produce high physical quality pellets. More research is needed to identify which factors have a positive or negative effect on pelleting process and to find new strategies to improve pellet physical quality.