英语翻译

问题描述:

英语翻译
Eighteen Pens of crossbed beef heifers (aproximately 100 head/pen and 9 pens/treatment) were randomly assigned to receive either 0 (control) or 200mg ractoamine/head•d-1

18个畜栏的杂交小母牛(大约100头/栏,并且9栏/注射,随机注射盐酸莱克多巴胺(一种动物催增剂),或者不注射0(控制样群),而需要注射的每头猪则每天注射200毫克.