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gestation period and success rates of AI
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<blockquote data-quote="Frankie" data-source="post: 37668" data-attributes="member: 13"><p>"Actually size isn't the criteria. Hereford and Red Poll run about 189 (288 by the MARC study),limo 289, Branvieh 290, all the other continentals run 286-287 (MARC study) Angus is 283"</p><p></p><p>Aren't Hereford and Red Poll moderate sized animals? They have a shorter gestation length. Continentals are larger and have longer gestation lengths according to your post. Why are you saying size isn't the criteria?</p><p></p><p>I have to disagree with 283 days for Angus, Dun. That's the table we use, but our Angus almost never go that long. Heifers are often two weeks early, and cows are generally less than 280 days. Our larger Angus, Max, Woodhill Valor cows, will run longer than our EXT cows. When we have a cow go the 283 days or longer, I start worrying and usually have good reason. We have an 8180 cow that had her first calf 18 days early. Her second calf was about two weeks early. It'll be interesting to see how she does this spring. Some people claim the bull has some influence in gestation length. I know people who say if they miss a cow on the first breeding, they'll breed her to GT Max because the calves will come early. That keeps the cow closer to the date he wanted her to calve with the first breeding. I suppose variations could be expalined by management, but we manage them all the same.</p></blockquote><p></p>
[QUOTE="Frankie, post: 37668, member: 13"] "Actually size isn't the criteria. Hereford and Red Poll run about 189 (288 by the MARC study),limo 289, Branvieh 290, all the other continentals run 286-287 (MARC study) Angus is 283" Aren't Hereford and Red Poll moderate sized animals? They have a shorter gestation length. Continentals are larger and have longer gestation lengths according to your post. Why are you saying size isn't the criteria? I have to disagree with 283 days for Angus, Dun. That's the table we use, but our Angus almost never go that long. Heifers are often two weeks early, and cows are generally less than 280 days. Our larger Angus, Max, Woodhill Valor cows, will run longer than our EXT cows. When we have a cow go the 283 days or longer, I start worrying and usually have good reason. We have an 8180 cow that had her first calf 18 days early. Her second calf was about two weeks early. It'll be interesting to see how she does this spring. Some people claim the bull has some influence in gestation length. I know people who say if they miss a cow on the first breeding, they'll breed her to GT Max because the calves will come early. That keeps the cow closer to the date he wanted her to calve with the first breeding. I suppose variations could be expalined by management, but we manage them all the same. [/QUOTE]
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