3-6月龄断奶犊牛日粮营养物质消化规律的研究

The Digest Profile of Nutrients of 3 to 6 Months’ Heifers

后备牛的培育是提高牛群质量和生产水平的一项重要技术措施。选择3-6月龄断奶犊牛各5头,共计20头,采用内源指示剂法(盐酸不溶灰分,AIA)测定不同月龄断奶犊牛对饲料营养物质的消化利用情况。结果表明:在自由采食的条件下,3-6月龄犊牛饲料干物质采食量随月龄增加而呈直线上升,平均每月增加1.35kg/头;3-6月龄犊牛对饲料中营养物质的表观消化率具有显著变化(P<0.05),其中4、5月龄犊牛对饲料营养物质的消化率较3月龄略低,6月龄犊牛对饲料营养物质的消化率较3、4、5月龄犊牛都高。

It is an importance way to improve the production of herd by enhancing the cultivation of the replacement heifers. 20 heifers were selected to measure the digest profiles of nutrients in different months’ heifers. The results indicated that the dry matter intake (DMI) increased significantly with the month. The digestibility of nutrients also changed significantly with the month, the digestibility of heifers of 4th and 5th month were lower than 3rd months’, but the digestibility of heifers of 6th month were...