日粮烟酸改善了肉牛肌内脂肪沉积和脂质代谢
日粮烟酸改善了肉牛肌内脂肪沉积和脂质代谢
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发表时间：
2016
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通讯作者：
Ming-Ren Qu
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作者：
Zhu-Qing Yang;Lin-Bin Bao;Xiang-Hui Zhao;Can-Yu Wang;Shan Zhou;Lu-Hua Wen;Chuan-Bian Fu;Jian-Ming Gong;Ming-Ren Qu
烟酸（Nicotinic acid，NA）是NAD+/NADH和NADP+/NADPH的前体，参与脂质代谢等多种生化代谢。本试验旨在研究NA对肥育肉牛胴体性状、肉质、血液代谢产物和脂肪沉积的影响。将16头24月龄杂交阉牛按体重随机分为对照组（饲喂基础日粮）和NA组（饲喂基础日粮+ 1000 mg/kg NA）。在120天的饲养试验中，肉牛饲喂90%精料。结果表明，日粮中添加NA可提高背膘厚，但沿着降低背膘厚，提高背最长肌面积、肌内脂肪含量（17.14%vs.9.03%）、大理石花纹评分（8.08vs.4.30）、红度（a*）和色度（C*），降低背最长肌的胴体脂肪含量（不包括肌内脂肪）、pH 24 h和水分含量。此外，补充NA可提高血清HDL胆固醇水平，降低LDL胆固醇、甘油三酯、非酯化脂肪酸、总胆固醇、糖化血清蛋白和血尿素氮水平。此外，补充NA可提高背最长肌G6 PDH和ICDH活性。结果表明，日粮中添加NA可改善肉牛的胴体品质，调节血清代谢产物的组成。由于牛肉资源丰富，价格低廉，因此，在养牛业中添加NA是提高牛肉品质的一个很有前途的途径。
Nicotinic acid (NA) acting as the precursor of NAD+/NADH and NADP+/NADPH, participates in many biochemical metabolisms, such as lipid metabolism. The purpose of this study was to investigate the effects of NA on carcass characteristics, meat quality, blood metabolites and fat deposition in finishing steers. Sixteen crossbred steers at the age of 24 months were randomly allocated into control group (feeding basal diet) and NA group (feeding basal diet + 1000 mg/kg NA) by their body weight. The steers were fed a 90% concentrate diet in a 120-d feeding experiment. The results showed that supplemental NA in diet increased longissimus area, intramuscular fat content (17.14% vs. 9.03%), marbling score (8.08 vs.4.30), redness (a*) and chroma (C*) values of longissimus muscle, but reduced carcass fat content (not including imtramuscular fat), pH24h and moisture content of longissimus muscle, along with no effect on backfat thickness. Besides, NA supplementation increased serum HDL cholesterol concentration, but decreased the levels of LDL cholesterol, triglyceride, non-esterified fatty acid, total cholesterol, glycated serum protein and blood urea nitrogen. In addition, NA supplementation increased G6PDH and ICDH activities of longissimus muscle. These results suggested that NA supplementation in diet improves the carcass characteristics and beef quality, and regulates the compositions of serum metabolites. Considering the rich resource and low price, supplemental NA should be a promising way to improve the beef quality in cattle industry.