6～7月龄锦江黄牛能量需要量及其代谢规律研究

Study on energy requirements and metabolism rules of 6～7 month-old Jinjiang cattle

试验选用45头体重为(196.20±16.08)kg的6月龄健康锦江黄牛,分为5个处理,每个处理3个重复,每个重复3头牛。采用能量单因素变量设计,按照我国《肉牛饲养标准》(2004)中200 kg重量级肉牛日增重1.2 kg时综合净能推荐量80%、90%、100%、110%、120%5个能量水平配制试验日粮。结果表明,高能日粮有利于提高锦江黄牛日增重;在本试验营养水平和饲养条件下,干物质(DM)、有机物(OM)、粗蛋白(CP)、粗脂肪(EE)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)、Ca和P的平均表观消化率分别为83.61%、74.80%、82.75%、82.58%、83.16%、79.46%、63.27%和64.67%;锦江黄牛在6-7月龄的消化能维持需要量为66.989 MJ/d,代谢能维持需要量为32.849 MJ/d;6-7月龄锦江黄牛每增重1 kg需要35.535 MJ消化能或33.194 MJ代谢能;6-7月龄锦江黄牛的消化能和代谢能总需要量可按DER=35.535△W+66.989和MER=33.194△W+32.849计算。

Forty-five heahhy Jinjiang cattle at the age of 6 months weighed at （196.20＋-16.08） kg were selected to study the energy requirements and metabolism rules. All tested cattle were divided into five treatments, each treatment had three replication cattle, each replication had three cattle. Energy single factor variable design was used in this study. ＂Diets＂ nutrient levels were made according to the Feeding Standard of Beef Cattle （2004）, based on the level at 200 kg weight, 1.2 kg daily weight gain, five levels as follows： 80%, 90%, 100%, 110%, 120%. The result showed that high energy advantageous to the dai- ly gain of the tested beef cattle, and the digestibility of DM, OM, CP, EE, NDF, ADF, Ca and P were 83.61%, 74.80%, 82.75%, 82.58%, 83.16%, 79.46%, 63.27% and 64.67% respectively. Energy require- ments of Jinjiang cattle of 6-7 month-old can be estimated by the factorial models as follows： DER = 35.535 △W＋66.989; MER = 33.194△W＋32.849.