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- Title
饲粮中添加酪蛋白磷酸肽 对产蛋后期蛋鸡生产性能和钙代谢的影响.
- Authors
刘文沛; 马慧敏; 郑 铃; 徐 晨; 单昊书; 万晓莉
- Abstract
A single- factor design was used to investigate the effects of dietary casein phosphopeptide (CPP) on calcium metabolism of laying hens during late laying period. A total of 800 Hyline brown laying hens aged 58 weeks were randomly divided into five groups. The hens in the control group were fed a basal diet (T1 group). The experimental groups were fed the basal diets supplemented with 0.5 (T2 group), 1.0 (T3 group), 1.5 (T4 group), and 2.0 (T5 group) g/kg CPP, respectively. The results showed as follows: compared with the control group, the qualified rates of eggs in groups T2, T3, T4 and T5 were significantly increased (P<0.05); the tibia calcium content and tibia strength in T3 group were increased, while the serum alkaline phosphatase activity in T2 and T3 groups was significantly decreased (P<0.05). In duodenum, the carbonic anhydrase activity in T2 group was increased (P<0.05), the gene relative expressions of calcium binding protein and calcium pump in T4 group were significantly up-regulated (P<0.05), and the gene relative expressions of sodium- calcium exchange bodies in T3 and T5 groups were significantly up- regulated (P<0.05). The contents of calcium- binding protein in egg⁃ shell gland of T2 and T3 groups were increased (P<0.05). The relative gene expression level of alkaline phosphatase in experimental (T2, T3, T4, T5) group was up-regulated (P<0.05), while that of carbonic anhydrase was significantly down-regulated (P<0.05). In conclusion, dietary CPP can improve egg qualification rate and related enzyme activities in intestinal tract and eggshell gland of laying hens, and promote the serum calcium content and tibia strength. The T2 and T3 groups supplemented with 0.5 to 1.0 g/kg CPP had the best effect.
- Publication
Feed Industry, 2023, Vol 44, Issue 13, p49
- ISSN
1001-991X
- Publication type
Article
- DOI
10.13302/j.cnki.fi.2023.13.007