Written Paper

Genetic and phenotypic evaluation of the growth performance ofbhagnari and drought master x bhagnari female calves in Pakistan  [2003]

Waheed, A. Hyder, A.U. Khan, M.S.,University of Agriculture,Faisalabad (Pakistan). Dept. of Animal Breeding and Genetics

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Pedigree and performance records of 296 Bhagnari and Droughtmaster x Bhagnari crossbred cows maintained at the Beef ProductionResearch Centre, Sibi (Balochistan) accumulated over a period of 30years from 1969 to 1999, were utilized for the present study. The leastsquares means for birth weight, weaning weight and pre-weaningaverage daily gain were 23.49 plus minus 3.76, 107.46 plus minus 19.00and 390.00 plus minus 97 g having coefficients of variation of 12.89,13.75 and 13.75%, respectively. Year of birth significantly influencedbirth weight, weaning weight and pre-weaning average daily gain, whileseason of birth appeared to be a non-significant source of variation forall of the performance traits studied. Genetic group of the cows had asignificant effect on birth weight, while other traits including weaningweight and pre- weaning average daily gain, were non-significantlyaffected by the genetic group of the cow. Genetic group of the dam hada non-significant influence on body weights at birth and weaning (Pgreater than 0.05). The heritability estimates of birth weight, weaningweight and pre-weaning average daily gain were found to be 0.09 plusminus 0.02, 0.09 plus minus 0.01, and 0.01 plus minus 0.01, respectively.The estimates of phenotypic and genetic correlation between birth weightand weaning weight were -0.23 and -0.74, respectively. The estimatedbreeding values ranged from - 171.44 to 242.48 kg for birth weight andfrom -171.44 to 22.48 kg for weaning
weight. Estimated breeding valuesobtained were used to compute the genetic trends for variousperformance traits. The genetic trends for birth weight was negative andfor weaning weight it was slightly positive. All phenotypic trends werenegative with the exception of the one for weaning weight, which wasslightly positive.

From the journal

Pakistan Veterinary Journal (Pakistan)

ISSN : 0253-8318