Department of Veterinary Medicine, Federal University of Lavras, Lavras, MG, 37200-900, Brazil.
RG Genética Avançada, Água Boa, MT, 78635-000, Brazil.
Anim Reprod Sci. 2021 May;228:106751. doi: 10.1016/j.anireprosci.2021.106751. Epub 2021 Apr 14.
Effects were evaluated in Bos indicus cows of eCG and FSH on follicular growth, estrous expression, and pregnancy per artificial insemination (P/AI) as a result of fixed-time artificial insemination (TAI). In Experiment 1, extent of timing-of-ovulation synchronization among cows was evaluated after imposing an estrogen/progesterone-based treatment regimen. At progesterone device removal (D8), cows were administered: eCG, or FSH or served as untreated Controls. In Experiment 2, percentage of cows P/AI was evaluated when the Experiment 1-treatment regimen was imposed. On D10, all cows were artificially inseminated. In Experiment 3, cows were assigned to two treatment groups (Control and eCG) on D8 to evaluate percentage of cows P/AI and estrous expression. In Experiment 1, follicular dynamics were similar among treatment groups. In Experiment 2, follicular growth was greater (P = 0.0001) with the eCG treatment. There was an interaction of treatment × parity (P = 0.007) on percentage of cows P/AI. There was a greater percentage of primiparous cows P/AI in the eCG-treated than Control and FSH-treated cows. There was a greater percentage of eCG-treated multiparous cows pregnant as a result of TAI than Control cows. There was an interaction of treatment × parity (P = 0.005) on P/AI in Experiment 3, in which the eCG effect was more pronounced in primiparous cows. Treatment with FSH, therefore, was not as effective as eCG in stimulation of follicular growth or enhancing percentage of cows pregnant as a result of TAI. Physiological effects of eCG, however, were also more evident in primiparous cows.
效应评估在印度野牛奶牛的 eCG 和 FSH 对卵泡生长、发情表达和妊娠每人工授精（P/AI）由于定时人工授精（TAI）。在实验 1 中，程度的定时排卵同步牛评价后施加雌激素/孕激素为基础的治疗方案。在孕激素设备移除（D8），牛管理：eCG，或 FSH 或作为未处理的控件。在实验 2 中，百分比的牛 P/AI 进行了评估时，实验 1-治疗方案的实施。在 D10 时，所有的牛都进行了人工授精。在实验 3 中，牛被分配到两个治疗组（对照组和 eCG）在 D8 评估百分比的牛 P/AI 和发情表达。在实验 1 中，卵泡动力学在治疗组之间相似。在实验 2 中，卵泡生长较大（P = 0.0001）与 eCG 治疗。有一个治疗×产次（P = 0.007）对牛 P/AI 的百分比的相互作用。有更大比例的初产牛 P/AI 在 eCG 治疗组比对照组和 FSH 治疗牛。有一个更大比例的 eCG 治疗多胎牛怀孕的 TAI 比对照组牛。有一个治疗×产次（P = 0.005）在实验 3 中，P/AI 的相互作用，其中 eCG 的效果更为明显在初产牛。治疗 FSH，因此，没有像 eCG 一样有效地刺激卵泡生长或提高牛怀孕的百分比由于 TAI。然而，eCG 的生理效应也更为明显在初产牛。
