Effect of the sex separate and straight-run type of rearing on the performance, carcass and meat chemical composition in fast growing broilers (original) (raw)
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Open Agriculture
This study examined strain, sex and slaughter weight effect on performance, meat quality and yield of broiler chicken. One hundred and fifty-day-old chicks (broilers) were distributed randomly in a 3 × 2 × 4 factorial experiment, with 50 birds per strain (Ross, Aboaca and Anak) and 25 birds per sex. After trial, 32 birds per strain and 16 per sex were slaughtered at 4 different body weights (1,000, 1,500, 2,000, and 2,500 g) to determine carcass yield and meat quality. The results revealed significant strain and sex effect (P < 0.05) on growth performance of the broiler chicken. Ross strain had the highest feed intake (4883.25 g) and final body weight (2440.25 g) compared to Aboaca and Anak strains. Female broiler having heavier body weight (2431.66 g) and feed intake (4864.83 g) than the males for all strains. Aboaca birds had the highest carcass yields for all slaughter weight than Anak and Ross. The slaughter weight, irrespective sex and strains significantly influenced the ca...
Carcass Quality of Broiler Chickens of Two Hybrid Line Slaughtered in Different Age
Macedonian Journal of Animal Science, 2011
The evaluation of carcass quality of broiler chickens is a very important segment in production, manufacture and marketing of poultry products, which depends of many factors. The aim of this experiment was to determine some criterions of carcass quality (carcass mass, dressing percentage and their variances) of fattening chickens in dependence on the following factors: hybrid, sex, age and mixture composition. Forty male and forty female chickens of two hybrid lines Cobb 500 and Hubbard Classic at the fifth, sixth and seventh weeks of age were selected for slaughter by the random selection method. Chickens were fed with two different mixtures which contented different level of protein and energy and different values of the E : P rate. The dressing percentage was represented by three kinds of dressings: basic or traditional dressing, “ready for roasting” and “ready for grilling”. The obtained results showed statistically significant (P < 0.05) influence of age and sex on the carca...
Effect of genotype and sex on carcass characteristics of chickens raised in extensive system
Biotehnologija u stocarstvu, 2018
The aim of this work was to examine the possibility of using different poultry breeds for meat production in extensive systems, concerning their slaughter traits. Total of 200 birds of two genotypes were used in this trial: fast-growing hybrid Ross 308 and pure breed White Rock. Chicks were raised indoors until the age of 4 weeks and subsequently they were enabled to access the range. The trial lasted for 13 weeks. At the end of the trial, 10 male and 10 female chicks per breed were sacrificed for the evaluation of slaughter traits - dressing percentage, yield and share of carcass parts. It was established that both genotype and sex significantly affected carcass traits while genotype affected production traits. Chickens of the Ross 308 hybrid had higher body weights, better feed conversion ratio and higher mortality rate. Chickens of the Ross 308 hybrid had dressing percentage compared to the White Rock breed, while the male chickens had higher dressing percentage compared to the f...
The effect of rearing method (mixed sex, separate males and separate females) on the growth characteristics of broiler birds was studied from day old to 18 weeks of age. Method of rearing had significant effect (P<0.05) on all the growth and performance characteristics (live weight, weight gain, and rate of increase in live weight and weight gain) studied. The mixed sex group had higher live weight and weight gain at 4 and 8 weeks of age but was overtaken by the male sex group at 12 and 18 weeks of age. Regardless of the rearing method, the live weight and weight gain of the birds increased at increasing rate from day old to 12 weeks of age, and then increased at decreasing rate to 18 weeks of age. The live weight increased at the rate of 85.83, 164.58, 219.44, and 190.74 g/bird/week at 4, 8, 12, and 18 weeks, respectively in the males sex group. While the increasing rate in the mixed sex group was 101.25, 170.83, 191.67, and 175.93g/bird/week at 4, 8, 12 and 18 weeks of age, respectively. The live weight increase in the female sex group was 84.83,143.85, 177.75 and 155.70g/bird/week at 4, 8, 12 and 18 week of age, respectively. The effect of rearing method on the most economic parts of the broilers (breast weight, thigh weight and back weight) was significant (P<0.05) in all the sex groups except breast weight at 18 weeks and back weight at 4 and 8 weeks of age. This study therefore suggest that rearing of broilers from day old to 8 weeks of age might be economically beneficial when reared as mixed sexes rather than separate sexes KEYWORDS: Broilers, rearing method mixed sex, separate male and separate female
AGROFOR, 2019
The study was carried out to compare the carcass quality and the chemicalcomposition of breast and thigh meat in two lines of slow-growing male chickens -La Belle (LB) and Bresse Gauloise (BB) reared conventionally or outdoors, havingaccess to pasture. The birds were slaughtered at 12 weeks of age. Two-wayANOVA was used to assess the effect of the rearing strategies as well as the line onthe carcass quality and meat chemical composition. Rearing system affectedsignificantly the carcass traits of the birds. The lines reared on pasture had lowerlive and carcass weight as well as lower dressing percentage (P<0.001). On theother hand they had higher percent (P<0.001) of the edible by-products (neck andgiblets). The percentage of the breast meat was significantly reduced in the birdsthat had access to pasture (P<0.001), while thigh remained unaffected. Thepastured chickens displayed higher part of the wings (P<0.01). Outdoors rearinginfluenced the chemical composition in the ...
The effect of rearing method ( mixed sex, separate males and separate females) on the growth characteristics of broiler birds was studied from day old to 18 weeks of age. Method of rearing had significant effect (P<0.05) on all the growth and performance characteristics (live weight, weight gain, and rate of increase in live weight and weight gain) studied. The mixed sex group had higher live weight and weight gain at 4 and 8 weeks of age but was overtaken by the male sex group at 12 and 18 weeks of age. Regardless of the rearing method, the live weight and weight gain of the birds increased at increasing rate from day old to 12 weeks of age, and then increased at decreasing rate to 18 weeks of age. The live weight increased at the rate of 85. 83, 164.58, 219.44, and 190.74 g/bird/week at 4, 8, 12, and 18 weeks, respectively in the males sex group. While the increasing rate in the mixed sex group was 101. 25, 170.83, 191.67, and 175.93g/bird/week at 4, 8, 12 and 18 weeks of age, respectively. The live weight increase in the female sex group was 84.83,143.85, 177.75 and 155.70g/bird/week at 4, 8, 12 and 18 week of age, respectively. The effect of rearing method on the most economic parts of the broilers (breast weight, thigh weight and back weight) was significant (P<0.05) in all the sex groups except breast weight at 18 weeks and back weight at 4 and 8 weeks of age. This study therefore suggest that rearing of broilers from day old to 8 weeks of age might be economically beneficial when reared as mixed sexes rather than separate sexes KEYWORDS: Broilers, rearing method mixed sex, separate male and separate female
Asian-Australasian Journal of Animal Sciences, 2016
The objective of the study was to compare the carcass characteristics, meat quality, and blood parameters of slow and fast grown female broiler chickens fed in organic or conventional production system. The two genotypes tested were medium slowgrowing chickens (SG, Hubbard Red JA) and commercial fast-growing chickens (FG, Ross 308). Both genotypes (each represented by 400 chickens) were divided into two subgroups fed either organic (O) or conventional (C) systems. Chickens of each genotype and system were raised in a semi environmentally controlled poultry house until 21 d of age and were assigned to 5 pens of 40 chickens each. Then, O system chickens were transferred into an open-side poultry house with an outdoor run. At 81 d of age, 10 female chickens from each genotype and from each production system (n = 40) were randomly chosen to provide material for analysis, and were weighed and brought to the slaughterhouse to assess carcass characteristics and meat quality. The blood parameters were determined by using 5 female chickens from each genotype and from each production system (n = 20). FG had the higher live weight, along with carcass, breast, and thigh-drumstick weights compared to SG (p<0.05). FG had the higher breast yield, whereas SG had the higher thighdrumstick yield (p<0.05). The O system resulted in a higher amount of abdominal fat (p<0.05). In addition, the O system values were higher for dry matter, crude ash, crude protein, and pH 15 values in breast meat, and for crude ash, crude protein, and pH 15 values in drumstick meat (p<0.05). In addition, total saturated fatty acids, total mono-unsaturated fatty acids, and total omega 3 were significantly higher in the O system than in the C system. Thus, the O system showed a positive advantage compared to the C system regarding female chicken meat quality, primarily within the ash, protein, and total omega 3 fatty acid profiles. In conclusion, the present study indicated that the main factor affecting the carcass characteristics of female chickens was genotype, whereas the organic system contributed to enhanced meat quality. These findings provide a better understanding of the relative roles of genotype and production systems in female broiler characteristics, and might aid producers in designing their facilities to optimize yield and quality while maintaining acceptable animal welfare standards.
Effect of slaughter age on performance and meat quality of slow-growing broiler chickens
Annals of Animal Science, 2000
quality of slow-growing broilEr chickEns* * K a t a r z y n a P o ł t o w i c z , J o a n n a D o k t o r abstract the aim of the study was to determine the effect of age of slow-growing broiler chickens on growth performance and meat quality. subjects were hybrids between hubbard meat-type cockerels and yellowleg partridge polish native hens. chickens were raised indoors to 56, 70 or 84 days of age on deep litter under the same environmental conditions and fed ad litibum complete starter, grower and finisher diets containing 20, 18, 15 cp and 2825, 2825 and 2740 mE/kg feed, respectively. at the end of the experiment, 5 cockerels and 5 pullets were selected for slaughter from each age group and subjected to a simplified carcass analysis. breast muscles and leg muscles were evaluated for technological properties such as ph, colour, water holding capacity, drip loss, cooking loss and shear force. the results were analysed statistically using analysis of variance and duncan's multiple range test. the duration of rearing had an effect on carcass and meat quality. the highest, statistically significant differences in the analysed traits were found between chickens slaughtered at 56 and 84 days of age. the highest dressing percentage was obtained in birds raised until 84 days of age. youngest birds were characterized by the poorest muscle content of the carcass and the least favourable technological properties of meat. the highest growth efficiency was obtained when the hybrids were raised to 70 days of age. key words: broiler chickens, slow growing, hybrid, age, meat quality Some of the most important factors affecting the quality of poultry meat are origin and slaughter age. They mainly determine the organoleptic attributes of meat, but also have an effect on its technological properties. In the modern intensive poultry production, age at slaughter depends on whether birds attain the desired body weight, and for many years the duration of rearing has tended to decrease. This course of action is dictated by the desire to improve the economic results of rearing meat chickens, which should be slaughtered immediately after the birds reach the maximum rate of weight gain. On the other hand, the increasingly popular organic production This study was financed from funds for NRIAP statutory activity, project no. 1230.1. Unauthenticated | 149.156.48.2 Download Date | 8/6/13 10:15 AM Unauthenticated | 149.156.48.2 Download Date | 8/6/13 10:15 AM Effect of slaughter age on performance of slow-growing broilers
Dokladi na Bʺlgarskata akademiâ na naukite, 2023
An experiment with male layer-type chickens was carried out in the Institute of Animal Science-Kostinbrod, aiming to investigate their growth performance and carcass composition, as well as the cooking loss and tenderness of the meat at the age of 5 and 9 weeks. The birds were reared in controlled microclimate, with initial stocking density of 22 birds/m 2. After 5 weeks of age, fragmentation of the stocking density was applied and it was diminished to 7 birds/m 2. Chickens were slaughtered at 5 and 9 weeks of age, and 10 chickens of each age group were subjected to carcass analysis. The average live weight of the birds at 5 weeks was 329 g, while the 9 weeks old chickens reached 1096 g. In order to attain the weight of the first age of slaughter (5 weeks) the chickens gained 294.03 g with a feed conversion ratio of 2.97, whereas for the whole period the feed conversion ratio was 2.91. The dressing percentage of the 5 weeks old chicks was 51.26%. For the 9 weeks old it was 77.62%. The age affected the yield of the main carcass components and the older birds had higher yield of breast (P = 0.0035) and thighs (P < 0.0001). The cooking loss for both breast and thigh meat was higher in younger chickens (P < 0.0001).
J. World Poult. Res., 2020
Alternative chicken production systems have become popular in recent years due to animal welfare criteria and consumer's perceptions. General beliefs express that the meat quality of chicken reared under free-range systems is better than that of chickens under conventional production conditions. The aim of this study was to compare the meat quality and carcass traits of chickens raised in conventional and free-range systems. Either conventional or free-range systems used meat-type Hubbard JA57 birds with a slaughter age of approximately 78 days. For assessing carcass traits and meat quality, six male chickens were selected from each system. The meat quality parameters, pH at 45 minutes, ultimate pH, color coordinates, drip loss, cooking loss, and water-holding capacity were measured. Furthermore, proximate parameters, such as crude protein, total fat, and crude ash were determined. There were no significant differences in main carcass yield and breast muscles between chickens reared in two systems, however, color values dramatically were influenced by rearing systems. Breast muscle samples from birds reared under the conventional system had a smaller hue angle and saturation value than those from the free-range birds. Moreover, the drip loss parameter was significantly higher in free-range chickens. The ash and protein contents of breast muscles were similar although raw breast meat from free-range birds had significantly lower fat content. The results prove that a free-range rearing system can modify the appearance, color values, and fat content of chicken meat and it can be a part of the interests of meat production consumers.