10.6084/m9.figshare.9957437.v1
Andressa Stein Maffi
Andressa Stein
Maffi
Cássio Cassal Brauner
Cássio Cassal
Brauner
Lais Fernanda Mielke
Lais Fernanda
Mielke
Marcio Erpen Lima
Marcio Erpen
Lima
Eduardo Gularte Xavier
Eduardo Gularte
Xavier
Francisco Augusto Burkert Del Pino
Francisco Augusto Burkert Del
Pino
Marcio Nunes Corrêa
Marcio Nunes
Corrêa
Insulin effect during a Heatsynch protocol in dairy cows
SciELO journals
2019
dairy cow
insulin
ovarian follicle
reproduction
2019-10-09 02:49:38
Dataset
https://scielo.figshare.com/articles/dataset/Insulin_effect_during_a_Heatsynch_protocol_in_dairy_cows/9957437
<div><p>ABSTRACT: The 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.</p></div>