«Department of Animal Production1, Department of Poultry Production2, Faculty of Agriculture, Ain Shams University, Cairo, Egypt KARIMA A. SHAHIN1 and ...»
The proportion of total carcass muscle in breast did not altered by diet but those of thigh and neck did altered by diet. Similar findings have been reported by LEESON et al. (1996) and PETER et al. (1997) who found that the proportion of meat in valuable parts of the carcass was influenced less by diet and more by slaughter weight. It seems that the distribution of muscle is influenced by total carcass muscle not by nutritional treatments.
Carcasses of chicks fed high fiber (with either low or high protein) diets had higher proportion of bone, higher proportion of total meat in thigh and neck, but less proportion of boneless carcass than carcasses of chicks fed low fiber (with either low or high protein) diets. Increasing crude fiber in diets resulted in lowering proportion of total fat in breast, thigh but increasing proportion of total fat in drumstick and wing.
Diet did not influence bone weight distribution. It seemed that bone weight distribution is independent of diet.
In the present study, diet significantly affected nearly all muscle: bone, meat: bone and muscle: fat ratios in various carcass parts. These ratios can be used as a measures of SHAHIN; ELAZEEM: Effects of breed, sex and diet of broiler chickens carcass desirability; a higher ratio being better than a low one. It is of interest to note that muscle: bone ratios in breast of chicks fed high fiber diets were lower than corresponding ratios of chicks fed low fiber diets, while the opposite trend was observed for muscle: bone ratios in drumstick. No comparable data were found in the literature.
Genetic and nutritional Interactions Breed x sex, breed x diet and sex x diet interactions did not significantly influence most of carcass traits indicating that the factors under consideration act independently of each other's. The absence of significant interactions on these traits indicated that the effect of diet was essentially the same regardless of breed and sex and indicated that differences between diets tended to be similar for different breeds and sexes. SHAHIN et al. (1996) found significant breed x sex interactions for proportion of total lean in breast and thigh and for proportions of bone in all cuts whereas the differences between males and females were greater in some breeds than in others.
Table 6 Means for major carcass tissues and bone weight distribution with significant sex x diet and breed x diet interactions (Durchschnittswerte der wichtigsten Gewebe- und Knochengewichtsanteile mit signifikanten Geschlecht:Fütterung und Rasse:Fütterung Interaktionen) High Protein Low Protein
Significant sex x diet interactions was found for carcass fat and boneless carcass relative to live body weight: the sexual dimorphism in low protein diet is more pronounced than in high protein diets (Table 6). These indicated that the effect of diet on the above mentioned traits was dependent on the sex of bird and the differential responses in these traits may be more important than the main effects. Such information is sparse in the literature.
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