苜蓿青干草对肉牛生产性能及胆固醇代谢的影响

选取日龄、体质量、性别、健康状况一致的西门塔尔牛×延边牛杂交一代(F1)生长肥育肉牛16头,随机分为4个处理组,每组4个重复,分别在饲粮中用不同水平苜蓿(Medicago sativa)青干草代替等量花生秧和棉籽壳,研究其对肉牛生产性能和胆固醇代谢的影响。结果表明,1)苜蓿青干草替代部分粗饲料可以提高日增体质量20、80和30 g(P0.05),而且随着苜蓿青干草添加量的增加,试验牛血清碱性磷酸酶含量逐渐升高并显著高于未添加组(P0.05);2)添加苜蓿青干草可以显著提高肉牛肌肉中粗蛋白质和粗灰分的含量(P0.05),降低粗脂肪的含量(P0.05)。5.07、.5 kg/d添加组肉牛血清和肉中总胆固醇及甘油三酯含量极显著(P0.01)低于对照组,2.5 kg/d添加组显著下降(P0.05);5.0、7.5 kg/d添加组肉牛低密度脂蛋白胆固醇含量极显著下降(P0.01),并显著低于2.5 kg/d添加组(P0.05);高密度脂蛋白胆固醇含量各组之间差异不显著(P0.05)。

Effects of adding Medicago sativa hay into Arachis hypogaea hay and cottonseed hull on production performance and cholesterol metabolism of crossbred cattle

16 crossbred cattle of Simmental cattle×Yanan cattle were used to investigate the effects of mixtures of Medicago sativa hay and Arachis hypogaea hay and cottonseed hull with different alfalfa hay biomass (0, 2.5, 5.0 and 7.5 kg/d M.sativa hay) on production performance and cholesterol metabolism, and these cattle with the accordant years, quality, gender and health were randomly divided into four groups with four duplicates. This study showed that the mixtures of M.sativa hay and A.hypogaea hay and cottonseed hull significantly increased the daily gain of cattle by 20,80 and 30 g (P>0.05), and serum alkaline phosphatase in the cattle fed with mixtures was significantly higher than that in the cattle fed with A.hypogaea hay and cottonseed hull (P>0.05). The results of this study also indicated that the mixtures of M.sativa hay and A.hypogaea hay and cottonseed hull significantly increased the crude protein and ash content (P>0.05) and decreased the crude fat in muscle of cattle. The serum, total cholesterol and glyceric acid in the meat of cattle fed with 5 and 7.5 g/d M.sativa hay extremely and significantly decreased (P>0.01) when compared to that fed with A.hypogaea hay and cottonseed hull. The low density lipoprotein cholesterol in the meat of cattle fed with 5.0 and 7.5 g/d M.sativa hay was significantly lower than that fed with 2.5,7.5 g/d M.sativa hay(P>0.05), however, The high density lipoprotein cholesterol in the meat of cattle was not different between cattle fed with mixtures and cattle fed with A.hypogaea hay and cottonseed hull.