苜蓿干草切割长度对荷斯坦育成母牛采食与反刍行为和营养物质消化的影响

试验以3头8～10月龄、平均体重(300±22.4)kg的荷斯坦育成母牛为试验动物,采用3×3拉丁方试验设计,对2、4cm和自然全长3种理论切割长度的苜蓿干草对育成母牛采食与反刍行为和日粮营养物质消化的影响进行了研究。结果表明:随着苜蓿干草长度的增加,苜蓿干草采食时间、日粮采食时间、反刍时间、咀嚼时间明显增加(P<0.05);每日采食次数和每次采食的干物质采食量明显降低(P<0.05)。除苜蓿干草以外的日粮其他组分的采食时间、日粮采食时间与反刍时间的比例、日粮常规营养物质的消化率基本不受苜蓿干草长度的影响(P>0.05)。

Effects of Particle Size of Alfalfa Hay on Eating and Ruminating Activity, Dietary Nutrients Digestibility of Chinese Holstein Heifer

Three Chinese Holstein Heifers,with 8-10 month old and weighing(300±22) kg,were selected for a 3×3 Latin square design to study the effects of chopped length of alfalfa hay(2 cm,4 cm,and natural whole length) on eating and ruminating activity,dietary nutrients digestibility.The results showed that increasing the chopped length of alfalfa hay increased eating bout,time spent for eating the hay and ration,ruminating and total chewing activity of ration(P < 0.05).The ratio of eating time to ruminating time and nutrients digestibility were unaffected by the treatments(P > 0.05).The experiment suggested that forages in heifer’ ration should be shopped properly.