Effects of feeding low protein diets on reproductive performance of Lindian hens
To investigate the effect of feeding low protein diets on the reproductive performance of Lindian hens,720 Lindian hens and 120 Lindian roosters were randomly divided into control group,experimental group 1,and experimental group 2,each containing 240 Lindian hens and 40 Lindian roosters by using a method of random block design.The control group was fed with the conventional 15.06％protein level diets,the experimental group 1 and 2 was fed with diets with lower protein level of 13.03％and 12.03％,respectively,for 49 d,during which the egg-laying performance(including weekly egg-laying rate,average egg-laying rate,average egg weight and feed-egg ratio),mortality rate,and hatchability of fertile eggs(fertilization rate,hatching rate,and healthy chick rate)of hens were measured.The results showed that,there is no obvious regularity in the weekly egg-laying rate of each group of chickens,and average egg-laying rates of both experimental groups were significantly higher than that of the control group(P＜0.05),and no significant difference in average egg weight and feed-egg ratio was found among 3 groups(P＞0.05).The mortality rate in experiment group 2 was significantly higher(P＜0.01)than those of the control group and experimental group 1,while the fertilization rate and healthy chick rate were significantly lower than those of the control group and experimental group 1(P＜0.05),respectively.The hatching rate of experimental group 1 was significantly higher than that of the control group and experimental group 2(P＜0.05).It could be concluded that the 13.03％protein level diets had a positive effect on the reproductive performance of Lindian hens.
万方数据
维普
