甜菜碱对产蛋后期蛋鸡生产性能、蛋品质和血清生化指标的影响OA

This experiment aimed to investigate the effects of different betaine levels on the production performance,egg quality,and serum biochemical indices of laying hens during the late laying period.A total of 600 healthy 470-day-old Jinghong No.1 laying hens with uniform body condition were selected and randomly divided into five groups with eight replicates per group and 15 hens per replicate.The control group was fed a basal diet,while the experimental groups were fed the basal diet supplemented with 200(group BetⅠ),400(group BetⅡ),600(group BetⅢ),and 800 mg/kg(group BetⅣ)of betaine,respectively.The pre-test period was one week,and the formal test period was eight weeks.The results showed that compared with the control group,the average egg weight in groups Bet Ⅱ and Bet Ⅳ was significantly increased by 3.59%and 2.64%,respectively(P<0.05).The feed-to-egg ratio in groups Bet Ⅰ,Bet Ⅲ and Bet Ⅳ was significantly decreased by 8.64%,5.91%,and 6.82%,respectively(P<0.05).The eggshell strength in groups BetⅡ and BetⅣ was significantly improved by 47.55%and 62.59%,respectively(P<0.05).The albumen height in group BetⅠ to group Bet Ⅳ was significantly increased by 27.91%,26.50%,26.76%,and 25.86%,respectively(P<0.05).The yolk color in groups Bet Ⅰ and Bet Ⅱ was significantly enhanced by 19.13%and 14.80%,respectively(P<0.05).The haugh unit in groups BetⅡ,BetⅢ,and BetⅣ was significantly increased by 11.44%,12.49%,and 12.36%,respectively(P<0.05).The serum triglyceride(TG)content in group BetⅠ to group BetⅣ was significantly decreased by 46.57%,43.29%,51.09%,and 49.86%,respectively(P<0.05).The study shows that betaine can improve the production performance,enhance egg quality,and promote lipid metabolism in laying hens during the late laying period.Taking production performance as the core evaluation indicator,the recommended appropriate dietary supplementation level of betaine is 800 mg/kg.