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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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