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 - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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