Conception rates and sex concomitant of bali calves following oestrus synchronization and artificial insemination of frozensexed semen under farm conditions

Abstract

The objective of this study was to determine the conception rate of Bali cattle synchronized and artificially inseminated with frozen thawed sexed-semen concomitant with its calves sex. This experiment was conducted in two cattle farms in West Lombok Regency. Oestrus was synchronized with a single injection i.m. of 5 cc Lutalyse® containing 25 mg of PGF2α (Lutalyse, Sterile Solution, Pharmacia Animal Health). The observation was conducted in the responded cattle that artificially inseminated at once oestrus. Pregnancy diagnosis was conducted by rectal palpation at about day-90. In Farm 1, the conception rate (CR) of PGF2α -treated and non-treated animals were 29/63 (46.03%) and 71/75 (94.66%), respectively. However, in Farm 2 the corresponding values were 38/89 (42.70%) and 10/23 (43.48%), respectively. CR in both farms were found being 100%. Sex concomitant rate for female calves born in Farm 1 was found being 94/100 (94.00%), whilst in Farm 2, sex concomitant rate for male calves born was recorded to be 45/48 (93.75%). It was concluded that under farm conditions oestrus synchronization using PGF2α in conjunction with AI of frozen-thawed Bali sexed spermatozoa might be used with acceptable conception and calving rates that above 90 % concomitant with its respective calve-sex rates.