期刊
POULTRY SCIENCE
卷 101, 期 2, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.psj.2021.101610
关键词
dimethylglycine; laying performance; egg quality; late laying period
资金
- Earmarked fund for Jiangsu Agricultural Industry Technology System [JATS2021397]
- Earmarked Fund for National Natural Science Foundation of China [32002197]
This study investigated the effects of different levels of DMG on laying hens during the late laying period. The results showed that moderate supplementation of DMG can improve laying rate, egg quality, and follicle development. The optimal level of DMG for laying hens during the late laying period was estimated to be between 0.049% and 0.065%.
In this study, the effects of 5 graded dietary levels (0.025, 0.05, 0.075, 0.1, and 0.125%) of dimethylglycine (DMG) were studied in laying hens during the late laying period (71-78 wk). Graded doses of DMG from 0.025 to 0.125% in the diet produced quadratic positive (P < 0.05) responses in the laying rate, egg-feed ratio, yolk color, grade follicular weight, and the number of large white follicles and linear positive (P < 0.05) responses in average egg weight, and the number of large white follicles. With 0.1% DMG, the laying rate and egg-feed ratio improved (P < 0.05), and the abdominal fat percentage decreased. Considering the laying performance under the conditions used in this study, the best -fit model for the DMG requirements of laying hens was estimated to range from 0.049 to 0.065% DMG during the late laying period based on a regression analysis. The addition of DMG did not affect the total cholesterol (TCH) and triglyceride (TG) contents in the plasma of laying hens; however, it signifi-cantly reduced the abdominal fat rate. DMG may change the course of lipid deposition in laying hens during the late laying period. In conclusion, supplementation with DMG can improve the laying rate and follicles development of laying hens.
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