The values of luteal blood flow (LBF), total corpus luteum (CL) area (TAR), and progesterone (P4), during and after OvSynch (OvS) protocol in comfort (CP; n = 40) and hot periods (HP; n = 40) were compared. We investigated how low and high P4 values obtained before the application affected the parameters above during CP and HP periods. Blood samples were collected before the OvS application on day 0 (OVSd0), day 9 (OeG), and day 18 (9th day after OeG: OvSd9). The P4 (ng/mL) values of the animals exhibiting dominant follicles were between 0.12–0.82 in HC and 0.1–0.88 in CP (P4-2: 4.36–4.38 and P4-3: ≥7.36 ng/mL). The LBF values were measured on days 7 (OvSd7) and 9 (OvSd9) after the OeG. The P4 mean values at day 0 (OvSd0) were classified as low (P4-1), medium (P4-2), and high (P4-3). The LBF and the TAR values in the P4-2 and P4-3 on OeG day 9 were higher than in HP (p < 0.05; 0.001), but there was no significant difference in the P4-1. In conclusion, when the OvS program was initiated with low P4 values, no difference was observed between HP and CP in terms of LBF values; however, when the program was started with high P4 values, there were significant increases in LBF and TAR values in the CP compared to the HP.

中文翻译：

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舒适期和热期对经 OvSynch 协议治疗的奶牛黄体 (CL) 血流的影响

在 OvSynch (OvS) 协议期间和之后，在舒适 (CP; n = 40) 和热期 (HP; n= 40) 进行了比较。我们调查了在应用程序之前获得的低和高 P4 值如何影响 CP 和 HP 期间的上述参数。在第 0 天 (OVSd0)、第 9 天 (OeG) 和第 18 天（OeG 后第 9 天：OvSd9）应用 OvS 之前收集血液样本。表现出优势卵泡的动物的 P4 (ng/mL) 值在 HC 中介于 0.12-0.82 和 CP 中的 0.1-0.88 之间（P4-2：4.36-4.38 和 P4-3：≥7.36 ng/mL）。在 OeG 后第 7 (OvSd7) 和第 9 (OvSd9) 天测量 LBF 值。第 0 天的 P4 平均值 (OvSd0) 分为低 (P4-1)、中 (P4-2) 和高 (P4-3)。OeG 第 9 天 P4-2 和 P4-3 的 LBF 和 TAR 值高于 HP（p< 0.05; 0.001），但在 P4-1 中没有显着差异。总之，当 OvS 程序以低 P4 值启动时，HP 和 CP 在 LBF 值方面没有观察到差异；然而，当程序以高 P4 值启动时，与 HP 相比，CP 中的 LBF 和 TAR 值显着增加。