日粮对奶牛生产性能及经济效益的影响

60头中国荷斯坦奶牛饲喂4种不同紫花苜蓿干草配比、不同精粗比的日粮,以研究日粮配方对奶牛生产性能、经济收益的影响,确定最佳日粮配方。试验结果说明,大比例紫花苜蓿干草(紫花苜蓿=24%DM)、低精粗比(40:60)日粮极显著提高乳脂率(P<0.01);日粮营养水平提高(P<0.05),产奶量提高(P<0.01);最佳经济效益日粮为含大比例紫花苜蓿、精料比例低、营养水平较低的日粮(P<0.01);在低的精粗比例下,紫花苜蓿干草不是日粮成本的限制因素,而青贮饲料配比为日粮成本的限制因素。合理安排精粗比例,适当使用紫花苜蓿干草,可提高奶牛饲养经济效益。

Effect of Rations on Productive Performance and Economic Benefits for Dairy Cows

60 China Holstein Cows were allocated to 4 rations which have different levels of rations consisting of lucerne hay and concentrate to roughage with different ratios to study their influences on the productive performance and economic benefit on milk cows so as to detemine the best ration.The result shows that the rations of lucerne hay with large proportion(lucerne=24%DM)and lower ratio of concentrate to roughage(40:60)can significantly increase the fat percentage of milk;nutritional level of rations increased,so did the milk yield(P<0.05;P<0.01);the best rations with best economic benefit are the rations of lower ratio of concentrate to roughage and lucerne hany;the lucerne hay is not the restrictive factor for ration cost under the condition of lower ratio of concentrate to roughage,but silage content is.So proper ratio of concentrate to roughage and proper lucerne hay can increase the economic benefits of milk cows.