The aim of the study was to analyze the reproductive performance of sows during the first service, depending on the height of loin eye. Results of reproductive performance of sows of such traits as a: total number born of piglets, number of live and still-born piglets, number of piglets at day 21st and the number of piglets weaned, litter and piglet weight at 1st and 21st days, losses of piglets to 21st and 30th days, weaning to-first-service interval of gilts were compared. The gilts was devided into three groups depending on the height of loin eye: the I group ≥ 54.1 mm high of loin eye, the II group 54.0–46.1 mm and the III group ≤ 46.0 mm. It was concluded that gilts from the group I and II characterized significantly (P ≤ 0.05) lower weight of body in compare to gilts from III group, what was probably caused by their differ age. It was found out that the gilts from III group weaned significantly (P ≤ 0.01) more piglets than the gilts from I group.

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