The Relation of Site of Semen Deposit to Breeding Efficiency of Dairy Cattle

Abstract

A study involving 2,014 first services, four sites of semen deposition, ten technicians and thirty-four dairy bulls was made to determine the effect of different sites of semen deposit upon breeding efficiency of dairy cattle. The differences beween treatments (sites of deposition) were not significant when tested statistically. However, the differences between bulls and between technicians were significant at the 1 and 5 per cent levels, respectively. The treatment mean for semen deposited in the body of the uterus was slightly higher than when semen was deposited in the cervix, in each horn of the uterus or a combination of the body of the uterus and cervix. However, no significance is attached to these differences. This study is being continued. © 1951, American Dairy Science Association. All rights reserved.