I think that a CIDR might do the trick. They are temporary implants that contain the pregnancy hormone Progesterone. These fool the body into thinking it is pregnant. Of course when they are removed the heifer will cycle unless one is put right back in. I think the release of hormone lasts 7-10 days. I would consult a vet though because I believe that this would be off-label usage. Another thing is Lutalyse. This is a hormone as well. It causes the heifer to com into heat if she is not pregnant. If she is pregnant it will cause the heifer to dump the fetus. So while not exactly control, it will terminate the pregnacy.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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