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 - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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