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

大理石纹肉 乙酰辅酶A羧化酶 脂肪酸合酶 脂质代谢 动物科学 甘油三酯 脂肪组织 脂蛋白脂酶 生物 肉牛 干物质 脂肪酸 内分泌学 内科学 化学 丙酮酸羧化酶 胆固醇 医学 生物化学
作者
Qing Jin,Hang Zhao,X. M. Liu,Fachun Wan,Y. F. Liu,Hongrui Cheng,Weiwei You,G. F. Liu,Xiuwen Tan
出处
期刊:Animal Production Science [CSIRO Publishing]
卷期号:57 (3): 513-513 被引量:5
标识
DOI:10.1071/an15434
摘要

To evaluate the effects of β-carotene (βC) supplementation on lipid metabolism in the back fat of beef cattle, 120 continental crossbred (Simmental × 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 βC for 90 days, and then received no βC for 60 days (depletion period). The βC levels significantly increased in steers supplemented with βC (P < 0.01), and then decreased to the control level by Day 150. Back fat thickness decreased slightly with increasing βC 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 βC supplement level and both βC 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 βC-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 βC 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 βC supplementation suppresses back fat deposition in beef cattle by inhibiting fat synthesis and enhancing fat hydrolysis.
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