Oestration Cow - 搜索图片

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Spring-calving beef herds face nutritional challenges | Oklahoma State ...
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Female Cow Reproductive System Diagram - calibretips
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What Is the Gestation Period of a Cow? | Reference.com
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Anatomy of the reproductive system of the cow. | Downl…

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Hormones of a Cow's Oestrous Cycle. | Repro360
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实拍：世界上最强壮的牛，体长5米，体重超2吨，你可能早就吃过它-搜狐大 …
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YouTube > Megan Bull
Estrous Cycle of Cattle
YouTube · Megan Bull · 6.7万次播放 · 2017年6月26日
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the different types of cows and their na…

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