本试验旨在研究过瘤胃甜菜碱(rumen-protected betaine,RPB)对肉羊生长性能、营养物质表观消化率和血液生化指标的影响。选取60只4月龄的湖羊公羊,随机分成5个组:空白对照(Con)组、2.2 g/d甜菜碱组(B-2.2)、2 g/d过瘤胃甜菜碱组(RPB-2)、4 g/d过瘤胃甜菜碱组(RPB-4)和6 g/d过瘤胃甜菜碱组(RPB-6)。预试期15 d,正试期60 d。结果表明:1)与Con组相比,B-2.2组的肉羊平均日采食量、平均日增重和料重比差异不显著(P>0.05);干物质、粗蛋白质、中性洗涤纤维和酸性洗涤纤维的表观消化率无显著变化(P>0.05);血清总蛋白、尿素氮、总胆固醇、甘油三酯、高密度脂蛋白和低密度脂蛋白的含量无显著变化(P>0.05)。2)与Con和B-2.2组相比,RPB-2、RPB-4和RPB-6组平均日采食量差异不显著(P>0.05),平均日增重极显著提高(P<0.01),料重比极显著降低(P<0.01);干物质、粗蛋白质、中性洗涤纤维和酸性洗涤纤维的表观消化率无显著变化(P>0.05);显著降低了血清中尿素氮、总胆固醇和甘油三酯的含量(P<0.05),极显著降低了低密度脂蛋白的含量(P<0.01),极显著提高了总蛋白的含量(P<0.05),高密度脂蛋白含量差异不显著(P>0.05)。由此可见,在本试验中,饲粮中添加过瘤胃甜菜碱,可以提高肉羊的生长性能,改善蛋白质和脂肪代谢,适宜添加量为4 g/d。
This study was conducted to study the effects of betaine and rumen-protected betaine on growth performance, nutrient apparent digestibility and blood biochemical indices of lambs. Sixty four-month-old male Hu lambs were randomly allocated to 5 groups: control (Con) group, 2.2 g/d betaine (B-2.2) group, 2 g/d rumen-protected betaine (RPB-2) group, 4 g/d rumen-protected betaine (RPB-4) group, 6 g/d rumen-protected betaine (RPB-6) group. The experiment has a 15-day pre-experiment and a 60-day experiment. The results showed as follows: 1) compared with Con group, average daily feed intake, average daily gain and feed to gain ratio of lambs in B-2.2 group were not significantly different (P>0.05); the apparent digestibility of dry matter, crude protein, neutral detergent fiber and acid detergent fiber were not significantly changed (P>0.05); and the contents of total protein, urea nitrogen, total cholesterol, triglyceride, high-density lipoprotein and low-density lipoprotein in serum were not significantly affected (P>0.05). 2) As compared with Con and B-2.2 groups, the average daily feed intake in RPB-2, RPB-4, RPB-6 groups was not significantly different (P>0.05), however, average daily gain was extremely significantly increased (P<0.01), and feed to gain ratio of lambs was extremely significantly decreased (P<0.01); the apparent digestibility of dry matter, crude protein, neutral detergent fiber and acid detergent fiber were not significantly affected (P>0.05); the contents of urea nitrogen, total cholesterol and triglyceride in serum were significantly lowered (P<0.05), that of low-density lipoprotein was extremely significantly lowered (P<0.01), and that of total protein was significantly increased (P<0.05), while that of high-density lipoprotein was not significantly different (P>0.05). In conclusion, dietary addition of rumen-protected betaine is effective in improving growth performance of lambs and promoting protein and fat metabolism, and the optimal level is 4g/d.
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