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¹ Afyon Kocatepe Üniversitesi, Veteriner Fakültesi, Zootekni Anabilim Dalı, Afyonkarahisar - This study was carried out to compare the goodness of fit of four growth curve models to different body measurements of 328 Pirlak lambs born at Afyon Kocatepe University Research and Application Center in 2008 and 2009. Bertalanffy, Brody, Gompertz and Logistic models were used for this purpose. Coefficient of determination (R2) was used for goodness of fit. The best fitting models and R2 values were Bertalanffy ve Brody (R2=%93,00) for wither height; Brody for body length (R2=%90,52), chest depth (R2=%91,28), chest circumference (R2=%94,06); Bertalanffy for chest width (R2=%89,84), rump width (R2=%93,67) and shank circumference (R2=%84,94). Keywords : Growth curve, sheep, pirlak, body measurement