Uticaj sezone na rezultate veštačkog osemenjavanja ovaca

Abstract

This paper compares the results of insemination of Ile de France sheep on an intensive rearing farm with 2,000 breeding sheep, mostly gimmers. It examines two periods: the peak of sexual activity from July to September, with 890 insemi nations, and a lower activity period from February to March, with 714 inseminati ons. The first insemination was performed laparoscopically (LAI). After 5 days, a ram was introduced for the next 20 days to utilize the first subsequent cycle. Ul trasound pregnancy diagnosis was done 45-60 days after insemination, allowing a clear distinction between pregnancies from LAI and ram mating based on fetal size and structures. During the peak of breeding season, 649 sheep conceived after inseminati on (72.92per cent), and 98 from rams in the next cycle (15.10per cent). Overall, the lambing rate was 83.93per cent, with 747 pregnant sheep. During the out-of-breeding season, conception occurred in 649 sheep (72.92per cent), and 98 from ram mating in the next cycle (15.10per cent), resulting in a total lambing rate of 77.17per cent, from 551 pregnant sheep. The conclusion is that in good sheep farming conditions, the LAI technique is an acceptable and desirable procedure, especially in the category of young ewes, where the period of entry into the first estrus is unpredictable, as in the off-sea son period.