Research Regarding the Influence of Sesonality on the Estrus Induction and Synchronization Treatments with PRID, in Dairy Cows

The season of performing treatments can affect the results obtained after treatment of induction and synchronization of estrus in dairy cows. Synchronization treatments were performed with PRID-Intervet, which contains 1.55 grams of progesterone. The devices were inserted in to the vagina and withdrawn after 12 days, in the next five days they found that females were in heat and A. I. The treatments were conducted in the spring season (April-May), summer (July-August) and autumn (September-October). In spring season the females in heat rate was 70.83%, in summer it was 68.18% and in autumn the rate was 100.0%. Pregnancy rate was 82.35% in spring season, 26.66% in summer and 92.3% in autumn. The best results were obtained in autumn, although the worst in the summer season.