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英语翻译EighteenPensofcrossbedbeefheifers(aproximately100head/penand9pens/treatment)wererandomlyassignedtoreceiveeither0(control)or200mgractoamine/head•d-1

题目详情
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
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答案和解析
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.