Brake J
Department of Poultry Science, North Carolina State University, Raleigh 27695-7608.
Poult Sci. 1990 Oct;69(10):1659-63. doi: 10.3382/ps.0691659.
Broiler breeders were fed corn-soybean diets and reared under 8 h of incandescent light. Birds were photostimulated with a mixture of incandescent light and daylight at 20 wk of age. Corn-soybean breeder diets with 0, 2, 4, and 6% added poultry fat were fed from 24 to 64 wk of age. Daily feed allocations were adjusted to provide comparable calculated protein intake at peak egg production; calculated ME intake was 413, 437, 461, and 484 kcal per bird per day for the 0, 2, 4, and 6% added fat diets, respectively. Feed was gradually reduced such that ME intake reached 400, 415, 429, and 422 kcal ME per bird per day from 57 to 64 wk of age for the respective diets. When compared with 0%, all levels of added fat significantly increased egg production and feed conversion. Fertility was increased significantly with the 4% added fat when compared with fertility at 2%; fertility with 0 or 6% added fat was intermediate. Female body weight increased in a dose-related manner in response to added fat. Chicks per hen was maximized at 4% added fat. Taken together, the data are interpreted to mean that 4% added fat is near the optimum for broiler breeders.
肉种鸡饲喂玉米-大豆日粮，并在8小时白炽灯光照下饲养。在20周龄时，用白炽灯和自然光混合光照对鸡进行光刺激。从24周龄至64周龄，饲喂添加了0%、2%、4%和6%家禽脂肪的玉米-大豆种鸡日粮。每日饲料供应量进行调整，以使产蛋高峰期的计算蛋白质摄入量相当；添加0%、2%、4%和6%脂肪的日粮，每只鸡每天的计算代谢能摄入量分别为413、437、461和484千卡。饲料逐渐减少，从57周龄至64周龄，各日粮每只鸡每天的代谢能摄入量分别达到400、415、429和422千卡。与添加0%脂肪相比，所有添加脂肪水平均显著提高了产蛋量和饲料转化率。与添加2%脂肪时的受精率相比，添加4%脂肪时受精率显著提高；添加0%或6%脂肪时的受精率处于中间水平。母鸡体重随着添加脂肪量呈剂量相关增加。每只母鸡的雏鸡数在添加4%脂肪时达到最大值。综合来看，这些数据表明，添加4%脂肪对肉种鸡而言接近最佳水平。
