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Weight (kg)-age (days) data of 524 Horro sheep of Ethiopia were fitted to a Brodyfunction to estimate parameters of growth curve and their genetic and phenotypicparameters. Genetic and phenotypic relationships were also estimated between growthcurve parameters and weight at birth (BW), weaning (WW) six-month (WT6) and yearling(YW). For ewes Pearson correlations were also calculated between growth curveparameters and ewe productivity over first to fourth parities. Least squares means ofgrowth curve parameters A (asymptotic mature weight, kg), B (proportion of matureweight attained after birth) and K (the rate of maturity, kg gain kg<sup>-1</sup> body weight) were37.6, 0.88, and 0.27∙10<sup>-2</sup>, respectively. Heritability estimates were 0.29, 0.18 and 0.14 for A,B, and K, respectively. Genetic correlations between A and B, A and K, and B and K were0.39, −0.07, and 0.25 respectively. Genetic correlations of A and K with BW, WW, WT6, andYW were 0.27 and −0.13, 0.34 and 0.37, 0.44 and 0.61, and 0.67 and 0.66, respectively.The growth curve parameters have small but positive (r=0.05 to 0.28) relationship withindicators of lifetime productivity. Medium heritability estimates of A and K indicate thatprogress in improving these traits can be made through selection. WT6 and YW havemedium genetic correlations with the growth curve parameters and these may allow theuse of these weights as indirect early selection criteria for optimum growth curve

Estimation of genetic and phenotypic parameters of growth curve and their relationship with early growth and productivity in Horro sheep