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EnglishThe objective of this study was to evaluate the effect of exogenous insulin administration on follicular growth, estrus presentation and conception rate during a protocol of ovulation synchronization. Dairy cows were subjected to the Heatsynch protocol, with the insertion of an intravaginal device containing 1.9 g of progesterone (CIDR) and an intramuscular injection containing 2.5 mg of GnRH on day 0. On day 7, the CIDR was removed and subjects were given 12.5 mg of dinoprost. Also on day 7, Insulin Group (IG, n = 21) animals received a subcutaneous injection containing 0.25 IU / kg of recombinant human insulin and the control group (CG, n = 25) received a 0.9% NaCl injection. On day 8, an injection of 0.5 mg of estradiol cypionate was administered to all cows. Animals were inseminated 12 hours after estrus presentation or at day 10 at fixed time. Follicular development was evaluated on days 7, 9, and 10 using transrectal ultrasonography, estrus presentation was observed between days 8 and 10, and conception rate was evaluated 30 days after AI. There were no differences in growth rate, follicular diameter, estrus presentation, and conception rate. Therefore, application of a single dose of insulin does not promoted an increase in follicular size, estrus presentation and conception rate in dairy cows. portuguesO objetivo deste estudo foi avaliar o efeito da administracao exogena de insulina sobre crescimento folicular, apresentacao de cio e taxa de concepcao durante um protocolo de sincronizacao da ovulacao. As vacas holandes lactantes foram submetidas ao protocolo Heatsynch, com insercao do dispositivo intravaginal contendo 1,9 g de progesterona (CIDR) no dia 0 e uma injecao intramuscular de 2,5 mg de GnRH. No dia 7, o CIDR foi removido e foi aplicado 12,5 mg de dinoprost. Ainda no dia 7, os animais do Grupo Insulina (IG, n = 21) receberam uma injecao subcutânea de 0,25 UI / kg de insulina humana recombinante e o grupo controle (CG, n = 25) recebeu uma injecao de NaCl 0,9%. No dia 8 foi aplicado 0,5 mg de cipionato de estradiol em todas as vacas. Animais foram inseminados 12 horas apos a apresentacao de cio ou no dia 10 em tempo fixo. O desenvolvimento folicular foi avaliado nos dias 7, 9 e 10 por ultrassonografia transretal, a apresentacao de cio foi observada entre os dias 8 e 10 e a taxa de prenhez/IA foi avaliada 30 dias apos a IA. Nao houve diferenca quanto a taxa de crescimento e diâmetro folicular, apresentacao de cio e taxa de concepcao. A aplicacao de uma dose unica de insulina nao promove o incremento no tamanho folicular, apresentacao de cio e taxa de prenhez/IA em vacas de leite.

Insulin effect during a Heatsynch protocol in dairy cows