Effect of Intra-Vaginal Progesterone Insert on Fertility and Return to Estrus in Repeat breeder cows

An Intra vaginal progesterone insert on 14^th day post insemination was evaluated for its effects on conception rate and also return to estrus in non pregnant cows which were reported as repeat breeders. Pregnancy rates to pre-treatment insemination were 25% and 5% in treated and control groups respectively. 73.33% of non pregnant cows in treated group and only 36.84% of non pregnant cows in control group showed synchronized return to estrus between 18^th to 28^thdays of initial insemination. Conception rates to first insemination on resynchronized estrus following progestrone insert removal in treatment group was 36.36%, while in control group only 28.5% cows conceived to insemination on estrus between 18^th to 28^th days. The progestrone inserts improved conception rate in repeat breeder cows, to supplementation on day 14^th to 21^th of initial insemination. Also, progestrone inserts enhanced resynchronization return to estrus in non pregnant cows and improved overall pregnancy rate than control cows.