I have a purebred yearling heifer I plan on breeding next week. She was in the chute last week for pre breeding shots. Noticed a couple small patches of hair missing, like the size of a quarter. She was poured late Oct. with Dectomax, but went ahead and poured her again. Today, the Mrs. notices she is missing alot of hair. One large patch on her lower rib about 12 inches long, and 5 inches wide, left armpit area same story, and a few various others, but not that large. The patches look rather scabby, like a rash or something feel rough to the touch, and have NO hair. Any ideas? They were just moved to a new lot a month ago, plenty of straw, and stalks to lay on, getting a good breeder mineral, and the same ration of distillers, hay, corn, and silage. Just one out of a pen of 63 head. Any ideas? Allergies? Moldy feed? Stress? Fungus? Bacteria? Treatment????????????