The present investigation was to evaluate the genetic variation in semen characters in relation to fertility from 71 bulls used for Artificial Insemination (AI) programme. The bulls were classified as bull factors viz. breed, age, body weight, body condition, scrotal circumference and libido. Environmental and managemental factors were considered as season, ambient temperature and relative humidity during semen collection and AI stations. Friesian breed (100%) showed better phenotypic characteristics and 8-10 yrs of age groups gave superior performances. The largest volume obtained in...