A Study of Atretic Large Follicles in Six Sire-Groups of Holstein-Friesian Cows

Abstract

The incidence of atretic large follicles was found to be affected significantly by line of breeding, reproductive period, stage of postpartum interval, month, and individuality; it was not found to be affected significantly by inherent producing ability, time from parturition to involution of the uterus, or early loss of pregnancy. Most cows having atretic large follicles recovered from them without treatment. Breeding efficiency was appreciably lowered in affected cows of most lines because of atretic large follicles, but the magnitude of the response was dependent upon the line of breeding. © 1953, American Dairy Science Association. All rights reserved.