摘要
根据绵羊的营养参数和饲养标准,结合日增重水平,计算了不同日增重水平对应的体重月平均动态及其所对应的粗蛋白日需要量和代谢能日需要量。不同日增重水平,达到生长期望所需要的日数不同,日增重水平越高,达到生长期望总所需要的粗蛋白和代谢能越少,但月平均的日需要量越多。自由放养的东北细毛羊当年生羔羊的日增重水平仅相当于舍饲饲养日增重的100g水平,根据代谢能计算,年总需干草340kg,可以作为计算载畜量的基本参数。自由放养情况下,即使能量满足需要,粗蛋白也短缺。当年生羔羊日增重在150￣200g,9￣10月龄内体重达到46￣50kg是北方草地家畜生产的理想目标,通过补饲可以实现。
Based on nutrition and feeding standard for sheep,with a different growth level,calculated body weight dynamics to nutrition needs for lamb expected growth in a year. Growth rate in 150～200 g/d.h,i.e 175g/d.h,body weight of lamb could grow up to 47~52 kg in 9~10 month age which should be expectational purpose for sheep production and grassland management in natural grassland in north China.In fixed range of growth rate,the higher growth rate, the less of total needs for nutrition and energy to expected weight,but the more daily needs 0.34t/h.y of dry matter could satisfied needs of energy for lamb growth in extensive grazing,but shortage of crude protein (CP)was a limited factor for sheep production in natural grassland in north China.
出处
《四川草原》
2005年第4期41-44,共4页
Journal of Sichuan Grassland
关键词
生长动态
营养需求
粗蛋白
消化能
绵羊
自由放养
Growth dynamics
Nutrition needs
CP
ME(metabolizable energy)
Sheep
Extensive grazing
