Cholinesterase levels in two stocks of Wistar rats, effect of hypophysectomy

Abstract 1. 1. Brain cholinesterase (ChE) levels in Wistar rats from Mollegarden, Denmark (Mol: WIST) were found to be higher than in Wistar rats from Charles River, France (Cre: (WI)BR). 2. 2. Serum ChE levels were considerably higher in females than in males of both Wistar stocks. 3. 3. This difference disappeared after hypophysectomy such that male rat serum ChE levels increased while those in females decreased.