Turkish Journal of Veterinary & Animal Sciences
Assessment of genetic gain and its simulation for performance traits in Sahiwal cattle
The study was conducted to estimate the expected genetic gain (ΔG) for first lactation performance traits in Sahiwal cattle as a result of direct selection of animals maintained at the ICAR-National Dairy Research Institute in India. Data pertaining to 305-day milk yield (305DMY), wet average (WA), and calving to first insemination interval (CFI) of the animals considering 13 counts of progenies/ sire were initially analyzed. The ΔG through direct selection was 43.68 kg/year, 0.13 kg/year, and 1.68 days/year for 305DMY, WA, and CFI, which was 1.97%, 1.65%, and 2.02% of herd average, respectively. In addition, ΔG was estimated by simulating the number of progenies/sire by 50%, i.e. by 6 and 18. Upon simulation of the number of progenies/sire, the ΔG in 305DMY decreased by 14% and increased by 8%, respectively. A similar trend in ΔG was found when simulating the number of progenies/sire by 50% in WA and CFI. Expected ΔG was also assessed by increasing the number of progenies per sire gradually from 6 to 18. Initially, there was a noticeable increase in ΔG upon increasing the number of progenies/sire gradually from 6 to 11, but with a further increase in the number of progenies/sire, ΔG increased only gradually and the magnitude was found to be low.
Expected genetic gain, direct selection, simulation, Sahiwal
RATWAN, POONAM; CHAKRAVARTY, ATISH KUMAR; and KUMAR, MANOJ
"Assessment of genetic gain and its simulation for performance traits in Sahiwal cattle,"
Turkish Journal of Veterinary & Animal Sciences: Vol. 44:
4, Article 16.
Available at: https://journals.tubitak.gov.tr/veterinary/vol44/iss4/16