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首页> 外文期刊>Theriogenology >Dynamics of follicular growth and progesterone concentrations in cyclic and anestrous suckling Nelore cows (Bos indicus) treated with progesterone, equine chorionic gonadotropin, or temporary calf removal
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Dynamics of follicular growth and progesterone concentrations in cyclic and anestrous suckling Nelore cows (Bos indicus) treated with progesterone, equine chorionic gonadotropin, or temporary calf removal

机译：用孕酮，马绒毛膜促性腺激素或临时小腿去除术治疗卵泡生长和孕妇脂肪脂肪和孕酮浓度的动力学

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The objective of this study was to investigate the effects of eCG and temporary calf removal (TCR) associated with progesterone (P4) treatment on the dynamics of follicular growth, CL size, and P4 concentrations in cyclic (n = 36) and anestrous (n = 30) Nelore cows. Cyclic (C) and anestrous (A) cows were divided into three groups. The control group received 2 mg of estradiol benzoate via intramuscular (IM) injection and an intravaginal device containing 1.9 g of P4 on Day 0. On Day 8, the device was removed, and the animals received 12.5 mg of dinoprost tromethamine IM. After 24 hours, the animals received 1 mg of estradiol benzoate IM. In the eCG group, cows received the same treatment described for the control group but also received 400 UI of eCG at the time of device removal. In the TCR group, calves were separated from the cows for 56 hours after device removal. Ultrasound exams were performed every 24 hours after device removal until the time of ovulation and 12 days after ovulation to measure the size of the CL On the same day as the CL measurement, blood was collected to determine the plasma P4 level. Statistical analyses were performed with a significance level of P <= 0.05. In cyclic cows, the presence of the CL at the beginning of protocol resulted in a smaller follicle diameter at the time of device removal (7.4 +/- 0.3 mm in cows with CL vs. 8.9 +/- 0.4 mm in cows without CL; P = 0.03). All cows ovulated within 72 hours after device removal. Anestrous cows treated with eCG or TCR showed follicle diameter at fixed-timed artificial insemination (A-eCG 10.2 +/- 0.3 and A-TCR 10.3 +/- 0.5 mm) and follicular growth rate (A-eCG 1.5 +/- 0.2 and A-TCR 1.3 +/- 0.1 mm/day) similar to cyclic cows (CTeCG 11.0 +/- 0.6 and C-TCR 12.0 +/- 0.5 mm) and (C-eCG 1.4 +/- 0.2 and C-TCR 1.6 +/- 0.2 mm/day, respectively; P <= 0.05). Despite the similarities in CL size, the average P4 concentration was higher in the A-TCR (9.6 +/- 1.4 ng/mL) than in the A-control (4.0 +/- 1.0 ng/mL) and C-TCR (4.4 +/- 1.0 ng/mL) groups (P < 0.05). From these results, we conclude that eCG treatment and TCR improved the fertility of anestrous cows by providing follicular growth rates and size of dominant follicles similar to cyclic cows. Additionally, TCR increases the plasma concentrations of P4 in anestrous cows
机译：本研究的目的是探讨与黄体酮（P4）处理相关的ECG和临时小牛去除（TCR）对卵泡生长，CL尺寸和P4浓度的动态（n = 36）和苯苯（n = 30）Nelore奶牛。循环（c）和贫瘠（a）牛分为三组。对照组通过肌肉内（IM）注射液相出2mg雌二醇苯甲酸酯，并在第0天内含有1.9g P4的阴道内装置。除去器件，将动物接受12.5mg DinoPorost Trometomine Im。 24小时后，动物接受了1mg雌二醇苯甲酸酯。在ECG组中，奶牛接收了对照组描述的相同治疗，但在设备移除时也接收了400 ui的ECG。在TCR组中，在牛去除后，犊牛与奶牛分离56小时。在器件去除后每24小时进行超声检查，直到排卵时间和排卵后12天在同一天测量CL的​​尺寸，因为收集血液以确定等离子体p4水平。进行统计学分析，具有P <= 0.05的显着性水平。在循环奶牛中，在方案开始时CL的存在导致装置去除时的卵泡直径较小（在没有CL的COWS的奶牛中的7.4 +/- 0.3mm。 p = 0.03）。所有牛在拆卸设备后72小时内排卵。用心电图或TCR处理的贫瘠母牛在固定定时人工授精（A-ECG 10.2 +/- 0.3和A-TCR 10.3 +/- 0.5mm）和卵泡生长速率（A-ECG 1.5 +/- 0.2和a-tcr 1.3 +/- 0.1 mm / day）类似于循环奶牛（CTECG 11.0 +/- 0.6和C-TCR 12.0 +/- 0.5 mm）和（C-ECG 1.4 +/- 0.2和C-TCR 1.6 + / - 分别为0.2毫米/天; P <= 0.05）。尽管Cl尺寸的相似性，A-TCR（9.6 +/- 1.4ng / ml）的平均p4浓度高于A控制（4.0 +/- 1.0 ng / ml）和C-TCR（4.4 +/- 1.0 ng / ml）组（P <0.05）。从这些结果来看，我们得出结论，ECG治疗和TCR通过提供类似于循环奶牛的滤泡生长速率和大小的卵泡生长速率和大小改善了贫瘠奶牛的生育率。另外，TCR增加了围杆奶牛中P4的血浆浓度

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