Effect of genotype and sex on carcass characteristics of chickens raised in extensive system (original) (raw)
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The Influence of Genotype and Sex on Carcass Characteristics at Broiler Chickens
In this experiences was studied the influence of genotype and sex on carcass characteristics (slaughter yield, participation percentage of the cut parts from the whole carcasses structure, the meat:bone ratio from carcass and from major parts of the carcass) at broiler chickens reared in identical conditions and slaughtered at 42 days old. The genetic material was represented of broiler chickens that belonged hybrids: „Ross-308” (control batch-Lc) and „Lohmann Meat” (experimental batch-Lexp). After slaughter, from each group were sampled 30 carcasses (15 per sex), was determined slaughter yield and participation percentage of the cut parts from the whole carcasses structure using gravimetric measurements. The meat:bone ratio was determined on 10 carcases from each batch (five per sex) that were manually deboned. For analysis of variance was used Mann Whitney test. The results of this experiment showed that sex influenced the slaughter yield (P≤0.05), participation percentage of the ...
Variation of meat-type chickens in relation to genotypes and age of slaughter on carcass indices
The experiment was conducted to compare the various carcass characteristics between two broiler strains. A total bird of 150 day-old chick of two commercial broiler strains (Marshall and Cobb, 75 each) were raised and at the end of 4, 6 and 8 weeks, 20 birds/strain; 40 birds/week, making a total of 120 birds were randomly selected from both strains for carcass analysis. The birds were starved of feed overnight and individually weighed to obtain starved live body weight. The birds were stunned and bled by severing the blood vessels and the nerve trunks at the roof of the mouth with a sticking knife. Thereafter, the birds were scalded, deplumed manually and eviscerated through a slit made between the end of the keel bone and rectum. Data were obtained on live weight (gram), eviscerated weight (gram), carcass weight (gram), dressing weight (gram), breast weight (gram), shank weight, thigh weight (gram), drumstick weight (gram) and back weight (gram). The visceral organs observed were liver, lungs,
Archives Animal Breeding, 2015
The results of this study constitute a part of a project aiming at developing a crossbreed suitable for an extensive rearing system, utilising local biodiversity. Hybrids from mating a commercial broiler's male component (C) with Green-legged Partridgenous (GP) or Sussex (Sx) hens were compared with Cobb broilers. The study included 720 chickens of 3 genetic groups. Up to the third week of age, all birds were fed with balanced mixtures recommended for broiler chickens. From the fourth week, the mixture was weekly reduced by 10 % for the birds kept extensively (E). The deducted part was replaced with wheat bran, and from the seventh week with wheat. E groups had access to runs and received green fodder. Birds were slaughtered in 12th week of life. Carcass yield, giblets and proportion of carcass elements were estimated along with meat traits. The body weight at the 6th, 9th, 12th week of rearing and dissection results indicated a good suitability of Cobb chickens for an extensive rearing system. Hybrids were characterised by a considerably smaller proportion of breast muscle and slightly bigger of thighs and drumsticks, compared with Cobb, which could result from their greater motor activity. Results obtained by C × Sx and C × GP chickens, such as final body weight, proportions of abdominal fat and carcass elements, and appropriate value of meat traits, point at the usefulness of these hybrids as a meat-type chicken under extensive housing conditions. Darker colour of chicken meat, derived from C cocks and Sx or GP hens crossbred, can constitute an indicator for their carcasses' identification on the market.
The Indian journal of animal sciences
Present study was undertaken to evaluate male birds of 4 different crossbreds chicken (PD1 × PD4 (A), PD1 × PB2 (B), PD1 × PD3 (R), PD1 × IWI (W)) for different carcass quality parameters at 10 and 18 weeks of age. At 10 and 18 weeks of age 8 and 6 birds each from each genetic group, respectively, were sacrificed to measure different carcass quality traits. Effects of age on each genetic group in respect to different carcass quality traits were also studied. All the traits on weight basis differed significantly between the genetic groups at 10 weeks of age. However, at 18 weeks of age pre slaughter body weight, shank, gizzard, giblet weight and all the cut up parts weight differed significantly. At 10 weeks of age statistical significance between different genetic groups was observed for feather, head, shank, eviscerated yield, liver, gizzard, abdominal fat and giblet%. Abdominal fat% was lowest in A. At 18 weeks of age head, shank, eviscerated and liver% differed significantly between genetic groups. Highest eviscerated% was obtained in B with lowest abdominal fat. Age effect was significant for eviscerated yield, liver, gizzard and abdominal fat in B. In R head, shank, liver, gizzard and giblet% reduced significantly at 18 weeks of age. Cut up parts percentage expressed as % of eviscerated weight showed significant difference between genetic groups for legs % at 10 weeks of age. Age showed significant effect for back and legs % in A and B, whereas R and W showed significant effect of age for neck and legs % and back and neck %, respectively. The results indicated that genetic groups and age significantly affect different carcass quality traits and B male recorded better eviscerated yield compared to other genetic groups. Legs cut % increases with increase of slaughter age.
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...
Semina: Ciências Agrárias, 2018
This study aimed to assess the effect of different breeds and crosses of broiler chickens and sex on growth, carcass characteristics, and tissue composition. The experimental design was a completely randomized design in a 6 × 2 factorial scheme, with six genotypes (New Hampshire – NHS, Jersey Black Giant – JBG, Rodhe Island Red – RIR, Indigenous Giant – IG, and the hybrids IG × NHS and IG × JBG) and two sexes (male and female). Each treatment was composed of five replications with three broiler chickens, totaling 180 broiler chickens. Zootechnical performance and growth were assessed through the Gompertz equation parameters. After slaughtering at 105 days, the characteristics of carcass and main cuts were determined by means of weight, yield, and proportion of tissue constituents (meat, bone, and skin). Regarding the Gompertz equation parameters, the genotype NHS presented a higher growth potential. Males presented higher live weight and carcass weights, except for IG. No difference...
DOAJ (DOAJ: Directory of Open Access Journals), 2014
In this paper was studied the effect of dietary energy and protein levels on characteristics of pectoralis major (P. major) muscle at broiler chickens, which were sacrificed at 35 and 42 days old. The genetic material was represented by broiler chickens that belonged to the "Ross-308" hybrid, with two groups (LC-control group and LE experimental group). During the growth periods (starter, growing and finishing) they have received compound feed ad libitum, with different energy and protein levels (LC-conforming to recommendations of Aviagen Company; LE-higher with 10%). After slaughter, from each group were sampled breast muscles (five per sex) and for P. major were determined: the weight, pH value, the thickness of myocytes (fiber diameter, cross-sectional area of fibers). At the LE group, high levels of dietary proteins and energy has significantly influenced pH value and the thickness of myocytes in the P. major muscle, as compared with LC. The sex and slaughter age has significantly influenced the fibers diameter from P. major muscle, which was thicker at female chickens, as compared with male chickens and at 42 days age vs. 35 days.
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.