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Márcio de Oliveira Marques,Fábio Morotti,Camila Bizarro da Silva,Mario Ribeiro Júnior,Rubens César Pinto da Silva,Pietro Sampaio Baruselli,Marcelo Marcondes Seneda 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.3
This study was conducted to evaluate the influence of category (heifers, primiparous or multiparous cows) on pregnancy rates in a large scaleresynchronization ovulation program. Nelore heifers (n = 903), primiparous lactating cows (n = 338) and multiparous lactating cows (n =1,223) were synchronized using a conventional protocol of estradiol/P4-based fixed-time artificial insemination (FTAI). Thirty days afterultrasonography, females who failed the first FTAI were resynchronized with the same hormonal protocol prior to a second FTAI. Thepregnancy status of each cohort was evaluated by ultrasonography 30 days after each FTAI. The average conception rate after the first FTAIand resynchronization was 80.5%. Heifers had a higher conception rate (85%) than primiparous (76%) or multiparous cows (78%; p = 0.0001). The conception rate after the first FTAI was similar among heifers (57%), primiparous cows (51%) and multiparous cows (56%; p = 0.193). After the second FTAI, heifers exhibited a higher conception rate (66%) than primiparous or multiparous cows (51%; p = 0.0001). These resultsdemonstrate the feasibility of resynchronization in large beef herds for providing consistent pregnancy rates in a short period of time. We alsodemonstrated that ovulation resynchronization 30 days after FTAI is particularly effective for heifers, providing a conception rate of up to66%.