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Artificial Insemination (AI) for Cattle
Shorthorn AI sire help
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<blockquote data-quote="Lucky_P" data-source="post: 1324797" data-attributes="member: 12607"><p>Short gestation time probably does play a significant role with regard to CED for some sires, but body shape also is important. Easier for a heifer to deliver a 60 lb snake than a 60 lb bowling ball.</p><p></p><p>Used, with good success, for a number of years, a Shorthorn sire with very high CED... his average gestation length is 271 days; small, slender calves, easily born - I'm comfortable using that one on virtually ANY heifer. </p><p>Some years back, we used an Angus bull that was noted for high CED/low BW... and those calves usually just fell out looking like a drowned rabbit... about 2 weeks early... but they'd get up and nurse quickly - and if you monkeyed with them within the first 24 hrs, after they got dry, they'd run a mile away. </p><p>But, the first calf we had by that bull was out of a mature cow - and it was big, dead, 108 lb heifer. You've also gotta be cognizant of what's behind the cow... if she's got big BW close up in her ancestry, it can show up when you're not expecting it.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1324797, member: 12607"] Short gestation time probably does play a significant role with regard to CED for some sires, but body shape also is important. Easier for a heifer to deliver a 60 lb snake than a 60 lb bowling ball. Used, with good success, for a number of years, a Shorthorn sire with very high CED... his average gestation length is 271 days; small, slender calves, easily born - I'm comfortable using that one on virtually ANY heifer. Some years back, we used an Angus bull that was noted for high CED/low BW... and those calves usually just fell out looking like a drowned rabbit... about 2 weeks early... but they'd get up and nurse quickly - and if you monkeyed with them within the first 24 hrs, after they got dry, they'd run a mile away. But, the first calf we had by that bull was out of a mature cow - and it was big, dead, 108 lb heifer. You've also gotta be cognizant of what's behind the cow... if she's got big BW close up in her ancestry, it can show up when you're not expecting it. [/QUOTE]
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