On 144 gilts from the Landrace breeding herd the effect was examined of the weight gain from birth to mating on the reproduction efficiency. Highly significant influence of daily gain from birth to mating was found on the age and body weight at mating and farrowing (P<0.001), confirmed by respective correlation coefficients (P<0.00l). Even though the gilts with higher growth rate gave more piglets (all, alive and reared), the effect of body weight gain on the number of reared piglets was found significant only at P<0.05. Also the correlation coefficient between the gain and number of piglets weaned was almost null.