植物甾醇对泌乳前期奶牛泌乳性能与繁殖性能的影响

[目的]研究添加不同剂量植物甾醇对泌乳前期荷斯坦奶牛生产性能及繁殖性能的影响。[方法]选用泌乳期相近的健康荷斯坦奶牛16头,随机分成4组,Ⅰ组为空白对照组,饲喂基础日粮,Ⅱ、Ⅲ、Ⅳ组分别在基础日粮中添加200、400和800 mg/d植物甾醇,研究不同添加量的植物甾醇对奶牛生产性能及繁殖性能指标的影响。[结果]Ⅱ组奶牛生产指标的变化最为明显。与空白对照组相比,Ⅱ组乳密度显著提高(P0.05),奶牛乳酸度、首次参配时间和空怀时间显著下降(P0.05)。与空白对照组相比,Ⅳ组牛乳乳脂、总干物质及酸度显著提高(P0.05),牛乳中非脂固形物含量及奶牛体温显著下降(P0.05)。[结论]添加植物甾醇可提高奶牛的泌乳量,并促进奶牛发情,缩短首次参配时间和空怀时间,改善奶牛体质,其中200 mg/d植物甾醇为最适添加量。

Effect of Phytosterols on the Lactation Performance and Reproduction Performance of Dairy Cows in Early Lactating Stage

[Objective] The research aimed to study the effects of adding different dose of phytosterol on the production performance and reproduction performance of Holstein dairy cows in early lactating stage.[Method] 16 healthy Holstein dairy cows with similar lactating stage were randomly divided into 4 groups （Ⅰ,Ⅱ,Ⅲ,Ⅳ groups）.The dairy cows in group Ⅰ （blank control group） were fed with the basal diet.The dairy cows in group Ⅱ,Ⅲ,Ⅳ group were fed with the basal diet with adding 200,400 and 800 mg/d phytosterol.The effects of adding different dose of phytosterol on the production performance and reproduction performance of dairy cows were studied.[Result] The production indices of dairy cows in group Ⅱ had the most obvious changes.Compared with group Ⅰ,the milk density in group Ⅱ was significantly increased （P ＜ 0.05）,milk acidity,the first hybridization age and non-pregnant time were significantly decreased （P ＜ 0.05）.Compared with group Ⅰ,milk fat,total dry matter and acidity of milk in group Ⅳ were significantly decreased （P ＜ 0.05）,non-fat solids content in the milk and body temperature were significantly decreased （P ＜ 0.05）.[Conclusion] Adding phytosterol could improve milk yield of dairy cows,promote the oestrus of dairy cows,shorten the first hybridization age and non-pregnant time and improve the physical condition.The optimum adding amount of phytosterol was 200 mg/d.