Genetic Studies and Development of Prediction Equations in Jersey${\times}$Sahiwal and Holstein-Friesian${\times}$Sahiwal Half Breds

  • Singh, P.K. (Department of Animal Sciences, College of Ag., GBPUA&T) ;
  • Kumar, Dhirendra (Department of Animal Sciences, College of Agriculture, G.B. Pant University of Agriculture and Technology) ;
  • Varma, S.K.
  • Received : 2003.08.07
  • Accepted : 2004.10.04
  • Published : 2005.02.01


First lactation records (174) of Jersey${\times}$Sahiwal and Holstein Friesian${\times}$Sahiwal half breds under 9 sires maintained at Chandra Shekher Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh, India from 1975-1983, were used to estimate the genetic parameters and to predict herd life milk yield and average milk yield per day of herd life from first lactation traits. The traits included were: age at first calving, first service period, first lactation period, first calving interval, first lactation milk yield, milk yield per day of first calving interval, herd life milk yield, herd life and average milk yield per day of herd life. Most of the production and reproduction traits were found to have positive and significant correlations between them on genetic as well as phenotypic scales. Total twelve regression equations were fitted. The prediction equation of herd life milk yield in both the genetic groups showed linear relationship with AFC, FSP, FLP, FLMY and MY/DCI and was apparent and significant. Similarly, polynomials for milk yield per day of herd life for J${\times}$S and HF${\times}$S half breds also showed linear trend, which was found highly significant. The highest and lowest $R^2$ values were found for FCI and AFC, respectively.


Genetic Study;Prediction Equations;Jersey;Holstein-friesian;Sahiwal


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