
05/16/09, 10:38 AM
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Join Date: Feb 2008
Posts: 72
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Quote:
Originally Posted by francismilker
Unless you know average birthweights from the bull in question I'd be leery about putting a bull of that size and stature on a small heifer or cow. It's just not the birthweight you have to deal with but also the extreme weight of a mature regular sized bull covering a smaller cow. It can be hard on the cow's frame and reproductive tract.
One option for A.I.ing could be to get ahold of an A.I. tech and tell them you need your heifer "brought-in" to heat. He/she can install a C-der (sp?) in the cow and leave it in for 7 days, then pull it and give her a shot of lutalyse. After 12 hours the heifer should be in prime estrus for breeding. It costs a little more but is worth is when trying to take care of a single animal.
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I would agree that the issue isn't just birthweight but also a mature bull covering a small heifer.
As far as AI goes, using the CIDR with the shot of lutalyse works well for bringing them into heat, but you wait 48 hours after the lutalyse, not 12. Alternately, if you've been able to see her cycling (vaginal mucus, behavior, etc.), you can try calling to get someone out that day. Not sure what the odds of that are - my practice can usually get someone out same day, but it's not always possible.
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