oestrous synchronization同期发情
oestrous diagnosis发情诊断
oestrous cycle发情周期;[动] 动情周期
oestrous symptom发情征状
oestrous rate发情率
oestrous period发情期
oestrous eycle动情周期
dairy cows during oestrous奶牛发情
oestrous goat serum发情母羊血清