Different lambing date lambs were grazing on the Songnen plain,which had varies of live weight development,such as Birth weight,Weaning weight,Absolute growth,Relative growth and Feeding period.

• 松嫩羊草草地有非常明显的季节性,以松嫩羊草草地为主要放牧场的东北细毛羊因不同的产羔期而有不同的生长发育过程。 12、3和6月份出生羔羊的出生体重、断奶体重、绝对增重速率、相对增重速率及饲养周期存在差异。