摘要
为探究康奈尔净碳水化合物-蛋白质体系(CNCPS)评价分析饲粮的均衡性,本试验首先运用CNCPS对7种饲粮进行评价分析,7种饲粮分别为基础原料+柠条、基础原料+黑麦草、基础原料+芦苇草、基础原料+燕麦草、基础原料+稻草、基础原料+稻壳、基础原料+玉米芯(分别对应试验1～7组);然后选择体重相近、体况良好的5月龄滩羊公羊[体重为(28.31±1.49)kg]105只,随机分为7组,每组15只,分别饲喂7种饲粮,通过饲养试验、消化代谢试验与生长性能加以验证.结果表明:1)试验5组快速降解碳水化合物(CA)含量最高,且不可降解碳水化合物(CC)含量最低,说明其碳水化合物(CHO)在瘤胃中拥有较高降解速率与利用率.试验4组快速降解蛋白质(PA)含量最高,说明其粗蛋白质(CP)在瘤胃中拥有较高降解速率,试验7组结合蛋白质(PC)含量最低,说明其CP在瘤胃中具有较高利用率.2)试验7组干物质(DM)、CP与粗脂肪(EE)的消化率较高,干物质采食量(DMI)与平均日增重(ADG)均属各组最大值.综上所述,含有玉米芯的试验7组饲粮具有较优的饲料转化率,对育肥滩羊饲喂效果最优,其次是含有燕麦草的试验4组.这说明通过高程度粉碎处理并与其他优质饲料配合使用,合理配制饲粮,可以有效利用营养成分较差的玉米芯.
Abstract
In order to explore the dietary balance of Cornell net carbohydrate protein system(CNCPS),seven diets were evaluated and analyzed using CNCPS.The seven diets were:basic material+Caragana microphylla,basic material+ryegrass,basic material+reed grass,basic material+oat grass,basic material+rice straw,basic material+rice husk,and basic material+corn cob(corresponding to trial groups 1 to 7,respectively).A total of 105 five-month-old Tan sheep with similar body weight and good body condition were randomly divided into 7 groups with 15 sheep in each group and fed 7 diets,respectively,which were verified by feeding experi-ment,digestion and metabolism experiment and growth performance.The results showed as follows:1)the content of rapidly degradable carbohydrate(CA)was the highest,and the content of non-degradable carbohy-drate(CC)was the lowest in trial group 5,indicating that the carbohydrate(CHO)had a high degradation rate and utilization rate in the rumen.The content of rapidly degradable protein(PA)in trial group 4 was the highest,indicating that the crude protein(CP)had a higher degradation rate in the rumen,and the content of bound protein(PC)in trial group 7 was the lowest,indicating that the CP had a high utilization rate in the ru-men.2)In trial group 7,the digestibility of dry matter(DM),CP and crude fat(EE)was higher,and the dry matter feed intake and average daily gain were the maximum values of each group.In summary,the diets in trial group 7 containing corn cob has the best feed conversion rate and the best feeding effect on fattening beach sheep,followed by the diets in trial group 4 containing oat grass.This indicates that corn cobs with poor nutrients can be effectively used through a high degree of crushing treatment and using them in combination with other high-quality feeds to rationally prepare feed grains.[Chinese Journal of Animal Nutrition,2024,36(11):7173-7184]
维普
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