4.7 Article

Effects of diet supplementation with rumen-protected betaine on carcass characteristics and fat deposition in growing lambs

期刊

MEAT SCIENCE
卷 166, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.meatsci.2020.108154

关键词

Sheep; Longissimus dorsi; Fat deposition; mTOR signaling

资金

  1. Research Foundation of the National Public Welfare Industry (Agriculture), Research on the technology of the sheep fattening and high-quality meat production in the South area of China [201303144]
  2. Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
  3. Yixin Feed Company

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This study evaluated the effects of dietary rumen-protected betaine (RPB) supplementation on the fat deposition of lambs. Sixty Hu sheep were randomly divided into 5 groups. The lambs were fed a control diet (CON) or diets supplemented with 1.1 g/d unprotected betaine (UPB), 1.1 g/d RPB, 2.2 g/d RPB or 3.3 g/d RPB for 70 days. Compared with UPB, the abdominal fat in 2.2 g/d RPB supplemented group was decreased (P < .05). Compared with CON and UPB, the fat contents in longissimus dorsi (LD) of RPB treatments were increased (P < .01). With increasing of RPB levels, the fat content in the LD was quadratically increased (P < .05). Compared with CON, genes expression of PI3K, mTOR and S6K1 in the LD of RPB treatments were up-regulated (P < .05). In conclusion, RPB supplementation decreased the abdominal fat in lambs but increased the fat content in lamb meat, and this effect might be regulated by mTOR signaling.

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