Unthriftiness, Hairy Fleece, and Tremors in Newborn Lambs

Abstract

SUMMARY Unthriftiness, hairy fleece, and tremors were observed in newborn lambs obtained from 2 ranches in northern California. The number affected ranged from 2 to 4%. Most affected lambs were offspring of yearling ewes. Pathologic changes consisted of hairy fleece with abnormal pigmentation, lymphoid hyperplasia, hypomyelinogenesis, and mild meningoencephalitis.