Effect of -carotene supplementation on the expression of lipid metabolism-related genes and the deposition of back fat in beef cattle

文献类型： 外文期刊

第一作者： Jin, Q.

作者： Jin, Q.;Zhao, H. B.;Liu, X. M.;Wan, F. C.;Liu, Y. F.;Cheng, H. J.;You, W.;Liu, G. F.;Tan, X. W.

作者机构：

关键词： beef quality;carotenoids

期刊名称：ANIMAL PRODUCTION SCIENCE （ 影响因子：1.533； 五年影响因子：1.779 ）

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收录情况： SCI

摘要： To evaluate the effects of -carotene (C) supplementation on lipid metabolism in the back fat of beef cattle, 120 continental crossbred (Simmental x local Luxi yellow cattle) steers were selected randomly from feedlots and allotted to four groups. Each steer was supplemented with 0, 600, 1200, or 1800 mg/day of C for 90 days, and then received no C for 60 days (depletion period). The C levels significantly increased in steers supplemented with C (P < 0.01), and then decreased to the control level by Day 150. Back fat thickness decreased slightly with increasing C supplementation, and significantly differed among groups after supplementation ceased (P < 0.01 on Day 120, P < 0.05 on Day 150). Significant regression relationships between C supplement level and both C content in back fat tissue on Day 90 and back fat thickness on Days 90, 120, and 150 were established (P < 0.01). No significant differences in the dry matter intake or average daily gain were detected, but higher net meat percentages were observed in the 1200 and 1800 mg/day C-supplemented groups compared with the control (P < 0.05). The mRNA expression of two fat synthesis-related genes, acetyl-CoA carboxylase and fatty acid synthase, were downregulated during the supplementation period, but upregulated during the next 60 days when the steers received no C supplementation. In contrast, the expression of two fat hydrolysis-related genes, hormone-sensitive lipase and adipose triglyceride lipase, were upregulated during the supplementation period and downregulated in the subsequent 60 days. The results showed that C supplementation suppresses back fat deposition in beef cattle by inhibiting fat synthesis and enhancing fat hydrolysis.

分类号： S

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