مقايسه عملكرد صفات توليدي آميخته هاي تجاري جوجه گوشتي

Comparing production traits performances of Commercial broiler Chickens in Iran

In order to evaluate the production performance of six hybrids broiler (Arborakers, Aryan, Cub, Hubbard, Lohaman and Ross) an experiment was conducted. Four hundred and eighty birds were allocated in a completely randomized design with 4 replicates and 20 birds per replicate from day old to 42 days of age. The performances of birds including growth rate, weight gain, food intake, feed efficiency, livability and production efficiency ratios were measured during the production period in order to compare the hybrids. Statistical analysis of performances criteria showed that there was significant differences in weekly weight gain among hybrids (p < 0.01), the weight of Cubs were higher than others by the end of 42 days of experimental periods while Hubbard had the lowest weight gain. Birds also differed significantly in the amount of food intake (p < 0.05), Ross had the lowest food intake and Cub had the highest intake. Since the weight gain was not similar and proportional to food intake, the hybrids also differed significantly in their feed efficiency ratio (p < 0.01). Cub had the lowest feed efficiency ratio while Lohman had the highest. There were no significant differences in livability ratio among the hybrids. The production efficiency ratio, a criteria that is relatively better indicator of performances (consisting of most performance and production criteria) was highest for Lohman, Weekly growth rate ratio and feed efficiency of all hybrids declined after 5th weeks indicating that there is relatively lower profit margin after 42 days of age. There were no significant differences in carcass ratio (to live body weight at the end of experiment), breast and leg ratio (to carcass weight) among hybrids examined. The abdominal fat percentage was lowest for Ross and highest for Lohman. Chemical analysis of carcass showed that Hubbard had the lowest fat percentage and highest protein content. Arborakers on the other hand, had the highest fat content while Ross had the lowest protein content in its carcass.