Abstract
In this study, the effects of vitamins A, D3 and E on fertility were investigated in the Pırlak sheep, whose estrus was synchronized in July, the hottest month of the region. Multiparous 80 Pırlak sheep in the same herd were used as animal materials. The estrus synchronization of the sheep were performed with 20 mg chronolone impregnated intravaginal sponge (Chronogest CR®) for 11 days and 480 IU intramuscular eCG (Chrono-Gest / PMSG® 6000 IU / 25 ml) at the time of sponge removal. Vitamin A (300.000 IU), D3 (100.000 IU) and E (50 mg) combination (Vigantol-E®1ml) was injected intramuscularly at the time of mating in Group 1 (n=40), while Group 2 (n=40) was not applied. The estrus, conception and litter size were determined as 92,5%, 87,5%, 1,54 in Group 1 and 90%,75% and 1,37 in Group 2 respectively and there was no statistical difference between in the groups (P> 0.05). As a result, it was determined in July that the desired levels of reproductive efficiency can be obtained with the 11 day progesterone+eCG synchronization method in Pırlak breed sheep. It was concluded that different studies should be conducted to reveal the effects of vitamin A, D3, E and application on fertility parameters more clearly.