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
50%SLx50%F and smallest in 100%Local. Lowest and highest
spermatozoa abnormalities were recorded to be in SL-499 and F-0054
respectively of AI station Dhaka. The significant highest sperm
motility rate was recorded in 50%SLx50%F and lowest in 75%Fx25%L
bulls. The significant maximum NRR was recorded in genetic groups
of 100%Local and minimum in 75%Friesianx25%Local. The highest
TSL(71.65x1.6u) was found in F-0064 and lowest (66.50x1.58u) was in
L-40275. Genotypes of progeny, sire and dam as well as grade of
feed had significant effect on the reproductive and productive
performances of female progeny.
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