Abstract
The reproductive performance of gilts significantly affects the number of annually produced piglets per sow. The paper presents the results of an analysis of the reproductive performance of gilts on a big pig farm in Vojvodina (Republic of Serbia), with a capacity of around 5,500 sows. Out of the total of 19,000 female piglets selected for reproduction, insemination, aged 210 days, a total of 5,420 (28.5%) gilts are prepared, and 70% of these are inseminated. A total of 29.3% gilts are culled for reproduction because of longterm pre insemination anestria (estrus was not established until the age of 9 months). It is believed that the basic reason for the occurrence of long-term anestrias is the inadequate technology for detecting estrus on the farm (once every 24 hours, without direct contact between the test boar and the gilts). As a consequence, there are significant economic losses in piglet production on the examined farm.
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