以下为句子列表：
英文: Proestrus: The female attracts males, has a bloody vaginal discharge and her vulva is swollen. Proestrus lasts approximately nine days; the female, however, will not allow coitus at this time.
中文: 发情前期：母犬开始引诱公犬，阴道有血渗出，阴户涨大。发情前期约持续九天，不过，这段时间，母犬并不与公犬交配。
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英文: A Case of Ocular Myiasis Caused by Oestrus ovis in Human
中文: 人羊狂蝇(Oestrus ovis)蝇蛆病一例
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英文: LH, E 2 and P 4 Levels from Weaning to Postweaning Oestrus in Primparous Sows
中文: 初产母猪断乳至发情的激素水平
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英文: Inducing Synchronized Oestrus of Female Deer by Using 15--Methyl--prostaglandinF2α and PMSG Treatment
中文: 应用前列腺素和PMSG诱导母鹿同期发情
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英文: Development of a RIA for Melatonin and Its Application to the Research on the Oestrus Mechanism of Out-of-season in Hu Sheep
中文: 褪黑激素RIA方法的建立及其在探索湖羊四季发情机理上的应用
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