蛋鸡低蛋白日粮的研究

选择２３周龄蛋鸡２６８８羽分成４组，分别饲喂不同蛋白质水平的日粮，其中第一组为对照组，第二、第三、四组为根据可利用氨基酸配制而成的低蛋白日粮。结果表明，第二、三、四组产蛋重分别比对照组低２．８９ｇ／日·只，２．７９ｇ／日·只，２．３３ｇ／日·只，产蛋率分别低２．８２，２．７２，２．０５个百分点，但其经济效益分别提高１６．９％，９．２％，３３．８％，其中蛋白质水平最低的第四组经济效益最好。

STUDY OF LOW PROTEIN DIET FOR LAYER

At 23 weeks of age,2688 laying hens were randomly allocted to four treatments,and were fed different level of crude protein diets,respectively. The first group was fed control diet,the other groups were fed low protein diets which were formulated according to the availability of amino acid. The results indicated that egg weight and laying rate of trial groups were reduced 2 89,2 79,3 33g/d.h and 2 82,2 72,2 05 percentage unit compared with the control group respectively. But economic efficiency of trial groups were raised 16 9%,9 2%,33 8%,respectively,percentagc,and the lowest level of CP had the best economic gain.