Abstract

    Data on 3984 lambing records of 1285 Lohi ewes kept at the Livestock Production  Research Institute, Bahadurnagar, Okara for he period 1960-90 were analyzed by using Harvey’s Mixed Model Least Squares and Maximum Likelihood Computer Program. The purpose was to estimate the magnitude of various environmental sources of variation influencing weaning weight in this breed of sheep. The least squares mean for 120-day adjusted weaning weight was 23.09 ± 0.13 kg. The trait was significantly (P<0.01) influenced by the year and season of birth, type of birth and the sex of the lamb born.

Key words: Lohi sheep, weaning weight, environmental factors