过瘤胃蛋白和丙二醇对乳牛瘤胃发酵、产乳量及乳成分的影响

用 8头荷斯坦黑白花奶牛 ,在饲粮中添加过瘤胃蛋白和丙二醇 ,研究其对乳牛瘤胃发酵、产乳量及乳成分的影响。结果表明 ,过瘤胃蛋白+丙二醇可显著提高丙酸浓度 (P <0 0 5) ,并且产乳量较对照组有增加的趋势。乳脂率、乳蛋白率、乳糖率及无脂固形物率 ,并未因添加过瘤胃蛋白和丙二醇而受到显著影响 (P >0 0 5)。乳蛋白质量、乳脂量及无脂固形物量 ,过瘤胃蛋白 +丙二醇组较对照组有增加的趋势 ,但差异均不显著 (P >0 0 5)。

Effects of rumen-bypass protein and propylene glycol on rumen fermentation, milk production and its components in dairy cows

Eight Holstein cows were used to evaluate addition of a combination of rumen bypass protein and propylene glycol(PG)on rumen fermentation,milk production,and milk components.Results showed that concentrations of propionic acid increased significantly (P<0 05)by the addition of rumen bypass protein+PG,and which increased milk production compared with the control group(P>0 05).The milk fat percentage,milk protein percentage,lactose percentage,and SNF percentage were not affected significantly by rumen bypass protein+PG supplement.The milk protein yield,milk fat yield,and SNF yield tended to increase by rumen bypass protein+PG supplement,but that were not significant compared with that of control groups(P>0 05).