A Study on Lysine Requirement of Youxian Shelducks during 1 to 42 Days of Age
The purpose of this experiment was to study the effects of dietary different levels of lysine(Lys)on growing performance,serum biochemical indices and whole body composition deposition of Youxian shelducks during 1 to 42 days of age,and to evaluate the lysine requirement.A Total of 525 healthy 1-day-old Youxian shelducks were selected and randomly divided into 5 groups with 7 replicates in each group and 15 ducks in each replicate.The dietary lysine levels were 0.85％,0.95％,1.05％,1.15％and 1.25％,respectively.The experiment lasted for 6 weeks.The results showed as follows:1)the final weight and average daily gain of 1.05％,1.15％and 1.25％lysine level groups were significantly higher than those of 0.85％lysine level group(P＜0.05),and the feed to gain ratio of 1.05％,1.15％and 1.25％lysine level groups was significantly lower than that of 0.85％lysine level group(P＜0.05).2)The serum uric acid content of 1.05％and 1.15％lysine level groups was significantly lower than that of 0.85％and 0.95％lysine level groups(P＜0.05),and the ser-um triglyceride content of 1.25％lysine level group was significantly higher than that of 0.85％,0.95％,1.05％and 1.15％lysine level groups(P＜0.05).3)The whole body crude protein content of 1.05％,1.15％and 1.25％lysine level groups was significantly higher than that of 0.85％lysine level group(P＜0.05).4)Using feed to gain ratio,serum uric acid and triglyceride contents and whole body crude protein content as i-dentification indices,the optimal dietary lysine levels of Youxian shelducks during 1 to 42 days of age estimated by quadratic curve were 1.11％,1.11％,0.99％and 1.16％,respectively.In conclusion,comprehensive all indices,the growth and development needs of Youxian shelducks during 1 to 42 days of age can be met by diet-ary lysine level of 0.95％under the conditions of this experiment,but the dietary lysine level of 0.99％to 1.16％is recommended for better growth performance,serum biochemical indices and body composition depo-sition.[Chinese Journal of Animal Nutrition,2024,36(12):7770-7777]
万方数据
维普
