TH and PHA in shorthorn cattle

Im writing a paper for my reproduction class and am looking for any information concerning TH and PHA in cattle.  Any info or advice is greatly appreciated. If you want to include pictures too, that would be great.
Thanks
kyshorthorns

Check out this article

http://kaisercattle.com/pdf/Its%20all%20in%20the%20genes.pdf

great article. I had a pha calf in may of 09. had to have the calf removed by c-section. Despite multi dosages of antibiotics to treat the infection, the cow died a month later. It was a bad deal. The sire of the calf was paddy o'mally. i bought the cow as a 1st calf hfr not knowing her pedigree.

This thread has a lot of material and photos. It also has references to some websites and articles.
Good luck.

http://www.steerplanet.com/bb/index.php?topic=22124.msg221932#msg221932