The Simmental breed is not known to carry either of those defects. IF the bull and the cow had suspect pedigrees that might have a streak of Maine or Shorthorn in them then I might be worried. I do not know of any purebred simmi genetics carry either TH or PH. Those defects have been limited to cattle carrying Maine (Stinger) and Shorthorn( Improver 57) genetics. (or Double Stuff- the double Whammy.)