Bennett C D, Leeson S
Department of Animal and Poultry Science, University of Guelph, Ontario, Canada.
Poult Sci. 1990 May;69(5):715-20. doi: 10.3382/ps.0690715.
Broiler breeder pullets were reared on a standard breeder-grower diet in accordance with breeder recommendations to 10 wk of age, with samples of the birds being selected for carcass analysis at 2, 3, 4, 5, 6, 7, 8 and 10 wk of age. At 10 wk of age, 264 pullets were assigned to one of three diets formulated to contain 15% CP and to provide 2,550, 2,800 or 3,080 kcal of ME per kg. The birds on the 2,800-kcal diet were fed to attain the body weight recommended by the breeder; the birds on the other diets received the same feed allotment. At 14, 16, 18, 20, 22, and 24 wk of age, 12 birds per treatment were slaughtered for carcass analysis. All of the birds were light-stimulated at 20 wk of age. From 2 to 10 wk of age, carcass analysis of the feed-restricted pullets revealed a relatively constant protein content, 20 to 21%, accompanied by a declining proportion of fat. Feeding a high-energy diet from 10 to 24 wk of age increased body weight and the absolute and proportional content of fat. The percentage of body protein was largely unaffected by the diet, but there was a consistent effect on fat content (P less than .05). The body fat and protein contents were highly correlated with body weight.
肉种鸡小母鸡按照种鸡饲养者的建议，用标准种鸡育成期日粮饲养至10周龄，在2、3、4、5、6、7、8和10周龄时选取鸡只样本进行胴体分析。10周龄时，将264只小母鸡分配到三种日粮组之一，这三种日粮的粗蛋白含量均为15%，每千克代谢能分别为2550、2800或3080千卡。饲喂2800千卡日粮的鸡只按照饲养者推荐的体重进行饲喂；其他日粮组的鸡只给予相同的饲料分配量。在14、16、18、20、22和24周龄时，每个处理组宰杀12只鸡进行胴体分析。所有鸡只在20周龄时进行光照刺激。在2至10周龄期间，限饲小母鸡的胴体分析显示蛋白质含量相对恒定，为20%至21%，同时脂肪比例下降。在10至24周龄期间饲喂高能日粮会增加体重以及脂肪的绝对含量和比例含量。日粮对体蛋白百分比的影响不大，但对脂肪含量有持续影响（P小于0.05）。体脂肪和蛋白质含量与体重高度相关。
