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Mon May 19, 2014 10:47 AM CDT

Question:

We bred a heifer that came out of a TH-positive (tibial hemimelia) bull to a tested TH-free bull. We never had the heifer tested but assumed, based on her appearance, that she was positive. Our understanding was that by breeding her to a negative bull, we could not wind up with a TH-positive calf. Yet the calf has all the symptoms of TH. Can one parent pass this along, or is there a possibility the bull was mislabeled? It has always been my understanding that in order to pass along ...

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