The aim of the study was estimating the relationship between the parameters of reproductive maturation of the crossbred gilts before first service and their reproductive performance at first and second reproductive cycle. Significant relationship were found out between age the first service of gilts and the number of piglets at 21 days and the number of the weaned piglets (0.282*, 0.276*), between weight of body of the gilts at first service day and the number of born piglets, at 21st day, weaned and weight of litter at 1st and 21st day of life and also average weight of piglets in 21st day (respectively: 0.482**, 0.507**, 0.490**, 0.381**, 0.509** and 0.234*). Also significant coefficients of correlation were found out between backfat thickness on shoulder (P1a) at first day of service and number of all born piglets (0.311*) and at 21st day of life (0.272*) and at weaning day (0.265*). There were significant correlations between backfat thickness at point P2a and number of piglets born alive (0.314*), at 21st day (0.248*) and at day of weaning (0.237*). During the first service the backfat thickness should be monitored to improve the reproductive performance.

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