Abstract
The data regarding birth weight performance of 3984 Lohi lambs progeny of 90 rams and weaning weight records of 3976 Lohi lambs progeny of 89 rams were used for the heritability estimation of birth and weaning weights, respectively. The lambs had halfsib relation among themselves. The flock was raised at Livestock Production Research Institute, Bahadurnagar, Okara and the collected data presents the flock performance for the period 1960-90. The estimate of heritability was worked out by the method of paternal halfsib analysis by using Harvey's Mixed Model Least Squares and Maximum Likelihood Computer Program (LSMLMW, 1990). The heritabilities of birth and weaning weights estimated were as 0.108:t: 0.027 and 0.147 ± 0.034 in Lohi sheep, respectively. Key words: Heritability, birth-weight, weaning-weight, Lohi sheep.
