Animal models were used to estimate genetic parameters and trends for growth and reproduction of Kenya Boran cattle. Sex, age of animal, parity and year-season effects affected birth weight (BW), weaning weight (WW), 12month weight (12W), 18month weight (18W) and 24month weight (24W). Herd-year-season of birth and calving, and age at birth and calving affected age at first calving (AFC), pooled calving interval (CI) and calving intervals (CI1), (CI2) and (CI3). Direct heritability (h2) from univariate analyses of growth were low to moderate. Maternal heritability for WW, 12W and 24W were low....