不同粗饲料对奶牛乳产量和乳成分的影响

选择18头荷斯坦奶牛,设置3个处理,每个处理6个重复,每个重复1头奶牛,研究不同粗饲料对奶牛泌乳性能和乳成分的影响,3个处理的粗饲料分别为玉米秸(Ⅰ组)、玉米秸+青贮玉米秸(Ⅱ组)、羊草(Ⅲ组)。试验结果表明:①试验Ⅱ组与试验Ⅲ组平均产奶量差异不显著(P>0.05),试验全期分别比Ⅰ组提高了8.82%(P<0.05)和9.57%(P<0.05);②不同处理间的乳糖、乳脂含量差异不显著(P>0.05);对于乳蛋白,在试验40d时3个试验组差异不显著(P>0.05),在第15d时Ⅱ组、Ⅲ组分别比Ⅰ组降低了7.43%(P<0.05)和8.57%(P<0.05)。对于乳干物质,Ⅱ组与Ⅲ组差异不显著(P>0.05)。根据上述生产性能指标综合评定,玉米秸+青贮玉米秸可有效替代羊草饲喂奶牛,而不降低泌乳性能。

Influence of different forage on dairy cattle milk yield and milk composition

Eighteen Holstein cows were used to study effects of different kinds of forage on milk production and milk composition.The three treatments were: corn straw, corn straw and Chinese wildrye, corn silage group (Ⅰ~Ⅲ), each treatment had six duplications and each duplication contained one dairy cow. The results were as follows: ①there were no significant differences on milk production between groupⅢand groupⅡ(P>0.05), but each group incressed 8.82%(P<0.05) and 9.57%(P<0.05), compared with groupⅠ; ②There were no significant differences in lactose and milk fat between three experimental groups (P>0.05); for milk protein,there were no significant differences between three groups on 40th day, but on 15th day, groupⅡand group Ⅲ decreased 7.43%(P<0.05)and 8.57%(P<0.05)compared with group Ⅰ; and for milk solids, group Ⅱand group Ⅲ didn't have significant difference (P>0.05). According to above synthesis evaluation of performance index, group Ⅲ could be effectively replaced by groupⅡ,and it also didn’t reduce dairy cattle milk yield.