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This gives her a better chance of becoming pregnant, and him a better chance of fathering her offspring. Extra precautions for heifers. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. That is, a cow is expected to show signs of heat every 21 days. A cow may return to heat even if she is fertile, and the bull is fertile, too. Or the bull was just checking her out. On the other hand, if the cow enters back into estrus 21 days after the last estrus cycle, it means the scow is not pregnant. The average duration of pregnancy for cows is 283 days. Wright down the date and watch next time around. If that happens, a cesarean section must be performed on the pregnant cow. Or could be a false heat. This comes from the bull himself. Getting a cow pregnant with sperm from a bull that is from a breed considerably larger in size can result in calves that are too large to go through a cow’s pelvis. I wouldn't worry yet, but if your assistance worked the first time I would put the cow in the pit so he can do his job. If the bull does not mount she is not in heat. Or she could be just coming in. "While watching bulls, physical deformities (deviated penis, inability to extend penis, etc.) If a cow mates with a bull and does not come into heat (or does not show the signs of heat) after another 21 days, it’s possible that the cow is pregnant. She may have been in when you were not watching and is just going out. Usually a 8 to 10 inches difference in height won't make a difference to a bull, but a miniature bull that is a foot shorter might need a little help. This gives her the best chance of becoming pregnant, and him the best chance of being the father of her offspring. Here’s the thing: It takes bull semen with bull sperm to get a cow pregnant. When there's a bull present, he will be hanging around and chasing after this cow that's in heat, and attempting to mount her. and other issues that can prevent successful intromission and ejaculation from occurring also can be identified. It makes sense for a bull to mate with a cow in heat as many times as he can. In these instances, a bull may be mounting cows in … To extract semen from a bull to use in artificial insemination, he is allowed to mount a cow in heat, and a tube placed over his penis before it enters the cow.

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