2010•Tamilnadu Journal of Veterinary and Animal SciencesRequires access
GENETIC ANALYSIS OF THE PRODUCTION PERFORMANCE OF FRIESWAL CATTLE
B. S. Lakshmi, B. Ramesh Gupta, M. Gnana Prakash, Krovvidi Sudhakar, Susheel Sharma
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Abstract
The data on 2393 lactations of various grades (6/16, 7/16, 10/16, 12/16, 14/16, 15/16 and 9/16 to 12/16) of Holstein Friesian x Sahiwal cows maintained at the Military Dariy Farm, Bowenpally, Secunderabad from 1988 to 2006 were utilized. The overall leastsquares means for total lactation milk yield, 300-day lactation milk yield, lactation length, peak yield, milk yield per day of lactation and milk yield per day of calving interval were 2864.32 kg, 2593.84 kg, 329.03 days, 13.30 kg, 8.69 kg and 6.40 kg, respectively. Genetic grades, period and season of calving and parity significantly affected all the production traits studied except for the season of calving on lactation length. However, sex of calf had no significant influence on any of the production traits studied. The heritabilities and genetic and phenotypic and environmental correlations, repeatabilities and Most Probable Producing Ability (MPPA) of cows in Genetic grade 7 were estimated.