The results were as follow:In test 1, 100 the first hybrid of Romney X Merino ram lambs were divided into 5 groups (20 animals each group) on basis of initial body weight.

• 试验一：试验采用120只罗姆尼杂交一代公羔羊作为试验动物，根据体重分为6组，每组20只羊。 除试验1组以外，其余5组分别饲喂成分依次叠加的添加剂，以研究添加剂不同组分对羔羊体增重的影响。