Effects of Dietary Methionine Level on Growth Performance and Blood Biochemical Indexes of Wuqin 10 Ducks Aged 1～4 weeks
The purpose of this study was to determine the appropriate methionine requirement of Wuqin 10 ducks aged from 1 to 4 weeks,and to provide reference for the scientific formulation of diets and the es-tablishment of feeding standards.A total of 280 one-day-old commercial Wuqin 10 ducks(equal numbers of males and females)were randomly divided into 5 groups,with 4 replicates per group and 14 ducks per replicate.The ducks in the five groups were fed diets containing 0.28％,0.36％,0.44％,0.52％and 0.60％methionine,respectively,for a 28-day experiment.The results showed that:(1)dietary methionine levels significantly affected the final weight,average daily weight gain and average daily feed intake of 1-4-week-old Wuqin 10 ducks(P＜0.05).The 0.36％and 0.44％methionine groups exhibited significantly higher values compared to the 0.28％methionine group,while there was no significant effect on feed to gain ratio(P＞0.05).(2)The semi-diving length of 0.36％and 0.52％methionine groups was significantly higher than that of the 0.44％methionine group(P＜0.05).The obligue body length and tibial length of the 0.52％methionine group were significantly higher than those of the 0.28％methionine group(P＜0.05).The chest width of the 0.36％,0.44％and 0.52％methionine groups were significantly higher than that of the 0.28％methionine group(P＜0.05).(3)There was no significant difference in organ index among groups(P＞0.05).(4)The serum albumin,globulin and alanine transaminase levels of the 0.60％methio-nine group were significantly higher than those of the 0.44％and 0.52％methionine groups(P＜0.05).The aspartate aminotransferase,uric acid and total cholesterol levels of the 0.28％methionine group were significantly higher than those of the 0.44％and 0.52％methionine groups(P＜0.05).Methionine levels had no significant effects on the total protein,alkaline phosphatase and triglyceride levels(P＞0.05).(5)Dietary methionine levels showed a significant quadratic correlation(P＜0.05)with 28-day body weight,average daily weight gain,average daily feed intake,alanine aminotransferase and triglyceride of the 1-4-week-old Wuqin 10 ducks.The appropriate dietary methionine levels were 0.416％,0.423％,0.414％,0.391％and 0.453％,respectively.In conclusion,the optimal dietary methionine level for 1-4-week-old Wuqin 10 ducks is 0.42％under the conditions of this experiment.
万方数据
维普
