Effects of Dietary Riboflavin Level on Laying Performance, Egg Quality and Plasma Biochemical Parameters and Contents of Riboflavin in Plasma, Yolk and Albumen of Pekin Ducks during Laying Period
1. College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, China;
2. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
3. Wuhu Animal Husbandry and Veterinary Bureau, Wuhu 241000, China;
4. College of Life Science, Shanxi Agricultural University, Taigu 030801, China
Abstract：This experiment was conducted to investigate the effects of dietary riboflavin level on laying performance, egg quality and plasma biochemical parameters and contents of riboflavin in plasma, yolk and albumen of Pekin ducks during laying period. A single factor completely randomize design was used, eighty 40-week-old female Pekin ducks during laying period were randomly divided into 5 groups with 8 replicates per group and 2 ducks per replicate. Ducks in the 5 groups were fed the experimental diets which riboflavin levels were 1.48, 3.98, 6.48, 11.48 and 16.48 mg/kg, respectively. The experiment lasted for 7 weeks. The results showed as follow: 1) dietary riboflavin level had no significant effects on body weight, laying rate and egg weight of Pekin ducks during laying period (P>0.05). 2) Dietary riboflavin level had no significant effects on eggshell strength, eggshell color, Haugh unit, yolk weight and yolk proportion of Pekin ducks during laying period (P>0.05). 3) Dietary riboflavin level had no significant effects on activities of alanine aminotransferase and glutamate aminotransferase and contents of total cholesterol, triglycerides, high density lipoprotein cholesterol, low density lipoprotein cholesterol in plasma of Pekin ducks during laying period (P>0.05). 4) Dietary riboflavin level had significant effects on the contents of riboflavin in plasma, yolk and albumen of Pekin ducks during laying period (P<0.05). With dietary riboflavin level increased, the contents of riboflavin in plasma, yolk and albumen of each group showed an increase trend, and reached a plateau when dietary riboflavin level increased to 11.48 mg/kg. In conclusion, dietary riboflavin level had no significant effects on laying performance, egg quality and plasma biochemical parameters of Pekin ducks during laying period, but can improve the contents of riboflavin in plasma, yolk and albumen. Using the contents of riboflavin in plasma, yolk and albumen as evaluation indexes, the estimated riboflavin requirement of Pekin ducks during laying period by broken line model are 6.91, 5.04 and 8.02 mg/kg, respectively.
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