Increasing the success of artificial insemination through control of local cattle estrus as a genetic resource

This paper aims to find out the application of I.B. in cows and the control of estrus to determine fertility and conception rate in cows. The research was conducted in two stages: field research to determine the influence of I.B. time on conception rate. Local cows in I.B. amounted to 62 heads, and crossbred cows with as many as 100 heads were grouped based on I.B. time and parity and analysed with the Z test. Fertility is determined by the size of the dominant follicle using ultrasonography, and the number of gardenings is determined 30 days after I.B. and 60 days of rectal palpation. Average conception rate at the beginning of estrus (45.70%), middle estrus (60.59%), end of estrus (68.91%), and six hours after estrus (61.55%). I.B. time had a significant effect (P<0.05) on the conception rate. Based on the results of this study, it was revealed that parity-3 had the highest pregnancy rate for local cattle (70.34%), while crossbreed cattle had the highest pregnancy rate at parity-2 (56.79%). The follicle size in Bali cattle was the same as that of local south coast cattle, including the small follicle size category