IMPACT OF TIME OF ARTIFICIAL INSEMINATION ON CONCEPTION RATE IN INDIAN YAK

Abstract

The female yaks (n=52) were detected in estrus by parading vasectomized bull between 8-9 am (morning)
and between 3-4 pm (evening). A group of females (n=18) detected in estrus in morning were inseminated twice
on the same day between 9-10 am and between 4-5 pm. The remaining females (n=13) detected in estrus in
morning were inseminated once on the same day between 4-5 pm. Further, the females detected in estrus in
evening were either inseminated twice (n=13) i.e. on the same day between 4-5 pm and next day between 9-10
am (n=18), or were inseminated once (n=8) on following day between 9-10 am. In all the groups, an almost similar
(p>0.05) conception rate was recorded between 53.8 to 62.5%. In brief, it may be concluded that if estrus is
detected in Indian yak either in the morning or in the evening, a single insemination may be done in the afternoon
of same day or in the morning of following day, respectively.