Data collected of 1722 lambs born from 1992 to 1999 in the one herd of Kurdish sheep in Bijar were used for estimation of genetic progress, phenotypic, genetic and environmental trends. Mixed model methodology based on a univariate and multivariate animal model was used for prediction of breeding value. Genetic, phenotypic and environmental trends were estimated by regressing means of breeding value, phenotypic value and differences between these values on year of birth, respectively. Total genetic progress after 8 years for birth weight (BW), weaning weight (WW) and 6-month weight (6MW) were 230, 970 and 882 gr, per year, respectively. Genetic trends for BW, WW and 6MW were 18±9, 128±55 and 129±71 gr per year, respectively. Also the phenotypic trends for BW, WW and 6W were –37±39, 380±431 and –173±308 gr per year, respectively. The environmental trends estimates for respective weights were –55±45, 252±308 and –301±359 gr per year, respectively.
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