RANDOM REGRESSIONS IN A BAYESIAN FRAMEWORK FOR MODELLING SEMEN PRODUCTION AND FERTILITY TRAITS IN HOLSTEIN FRIESIAN, HOLSTEIN FRIESIAN-CROSSBRED AND INDIGENOUS CATTLE
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Date
2022
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Abstract
The genetic potential of breeding bulls over the age of the bull was evaluated based on data on semen production (1,64,962 ejaculates), sperm abnormality (1527 ejaculates) and fertility (2,46,759 inseminations) traits collected from Bharatiya Agro Industries Foundation (BAIF) in Holstein Friesian purebred (120 bulls) and crossbreds (177 bulls) and indigenous bulls (189 bulls).
The semen production traits studied were ejaculate volume (EV- ml), sperm concentration (SC- 109/ml), initial sperm motility (ISM- %), post-thaw motility (PTM- %), the total number of spermatozoa per ejaculate (TNS- 109/ejaculate), and the theoretical number of semen doses (TNSD). The sperm abnormality traits were head abnormality (HA- %), mid-piece abnormality (MA- %), tail abnormality (TA- %), and total abnormalities (A- %). Conception rate (CR- %) was the only fertility trait included which was measured as a binary trait. The performance of HF purebred and crossbred bulls was better than indigenous bulls except for ISM.