以下为句子列表：
英文: A female comes into estrus a week or two after giving birth and, if she is not fertilized then, again about a month later.
中文: 生产后的雌马会在1~2周后进入发情期，如果这段时间没有怀孕，大约一个月后会再发情一次。
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英文: Bitches have their first estrus (also know as season or heat) after six months of age, although it can occur as late as 18 months to two years of age.
中文: 一些在母犬六个月龄后就会有第一次发情，有些则会迟至18个月甚至两岁。
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英文: During estrus, the female is fertile and will accept a male.
中文: 在发情期，母犬可以接受交配并且具有生育能力。
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英文: Even though there is no homosexual behavior (riding) like cows in horses, estrus detection in horses in easier than cows because of the longer duration of estrus.
中文: 不像牛有同性恋（母牛骑母牛），对于马而言没有，马的发情（发情持续5-7天）诊断不容易，因为发情持续期比牛（发情持续18-19小时）长。
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英文: 【Action and Use】It significantly enhances mature follicle ovulation and induces luteum to continue production in female animals. It can stimulate female animals into estrus.
中文: 本品可促进雌性动物成熟卵泡排卵和黄体生成，延缓黄体的存在；并能刺激卵巢分泌雌激素而引起发情。
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