本文旨在研究高精料饲粮中添加烟酸对肥育肉牛生长性能、养分表观消化率和血清生化指标的影响。选择体况良好、体重(402.2±25.4) kg的杂交公牛［西门塔尔( )×中国黄牛(♀)］24头,随机分成4组,每组6头牛。Ⅰ组、Ⅱ组、Ⅲ组和Ⅳ组在精料中分别添加200、400、600和800 mg/kg的烟酸(以干物质计),饲粮精粗比85: 15,试验期56 d。结果表明:补饲烟酸对干物质采食量没有显著影响(P>0.05),Ⅳ组的生长性能优于其余3组。Ⅳ组饲粮粗蛋白质、粗脂肪的表观消化率显著地高于其余3组(P<0.05),酸性洗涤纤维表观消化率显著地高于Ⅲ组(P<0.05),中性洗涤纤维表观消化率显著地高于Ⅱ组和Ⅲ组(P<0.05)。烟酸水平对血清葡萄糖、甘油三酯和β-羟基丁酸的浓度无显著影响(P>0.05),Ⅳ组血清非酯化脂肪酸浓度极显著地高于其余3组(P<0.01)。结果提示,高精料饲粮中补饲烟酸可提高肥育肉牛生长性能和养分表观消化率,本试验条件下以精料中添加800 mg/kg的烟酸效果较好。
The effects of nicotinic acid on the growth performance, nutrient apparent digestibility and serum biochemical parameters of finishing beef cattle fed of high concentrate diets were studied. A total of 24 healthy cross cattle )×Chinese yellow cattle(♀)] with initial body weight of (402.2±25.4) kg were randomly allocated into 4 groups with 6 cattle in each group. Cattle in groups Ⅰ, Ⅱ, Ⅲ and Ⅳ were fed concentrate supplemented with nicotinic acid at 200, 400, 600 and 800 mg/kg (DM basis), respectively. The dietary concentrate to forage ratio was about 85: 15. The experimental period lasted for 56 d. The results showed as follows: there was no significant difference in the dry matter intake of four groups (P>0.05), and the growth performance of group Ⅳ was better than that of the other three groups. The apparent digestibility of crude protein and ether extract of group Ⅳ was significantly higher than that of the other three groups (P<0.05), the apparent digestibility of acid detergent fiber of group Ⅳ was significantly higher than that of group Ⅲ (P<0.05), and the apparent digestibility of neutral detergent fiber of group Ⅳ was significantly higher than that of groups Ⅱ and Ⅲ (P<0.05). The content of serum non-esterified fatty acid of group Ⅳ was significantly higher than that of the other three groups (P<0.01), but there were no significant differences in contents of serum glucose, triglyceride and β-hydroxy-butyrate dehydrogenase (P>0.05). The results indicate that supplementation of nicotinic acid in high concentrate diet can obtain favorable effects on growth performance and nutrient apparent digestibility of finishing beef cattle, and 800 mg/kg is considered to be the optimal level in the concentrate under conditions in this study.
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