Relationship between bovine endometrial thickness and plasma progesterone and estradiol concentrations in natural and induced estrus.
Relationship between bovine endometrial thickness and plasma progesterone and estradiol concentrations in natural and induced estrus.
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DOI：
10.1262/jrd.2017-139
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发表时间：
2018-04-13
期刊：
影响因子：
--
通讯作者：
Katagiri S
中科院分区：
文献类型：
--
作者：
Sugiura T;Akiyoshi S;Inoue F;Yanagawa Y;Moriyoshi M;Tajima M;Katagiri S
本研究旨在研究15头奶牛自然发情和诱导发情期间子宫内膜厚度与孕酮（P4）和雌二醇-17β (E2)浓度的周期性变化。在前列腺素（PG） f2 α诱导的发情组，在PGF2α治疗前48-24 h至排卵后24 h（排卵=第0天），间隔6 h采用超声（USG）检测子宫内膜厚度。自然发情组在第一次排卵后第3天至第15-18天每48 h进行一次USG，然后每6 h进行一次USG，直至排卵后24 h。以第13天为参照日对子宫内膜厚度进行标准化。每次USG检查时采集血液，测定血浆P4和E2浓度。排卵前60 ~ 12 h，诱导发情组（n = 11）的子宫内膜厚度大于自然发情组（n = 9） （P < 0.05）。在自然发情组，在子宫内膜厚度增加之前，检测到P4减少和E2增加。在诱导发情组，根据排卵时间，在E2升高之前，P4降低的同时检测到子宫内膜厚度增加。这些结果表明P4浓度的降低可能是子宫内膜厚度变化的提示，而E2浓度的增加似乎维持和/或增强了这些变化。
The objective of this study was to investigate cyclical changes in endometrial thickness in relation to progesterone (P4) and estradiol-17β (E2) concentrations during natural and induced estrus in 15 cows. In the prostaglandin (PG) F2α-induced estrus group, ultrasonography (USG) at 6-h intervals was used to determine endometrial thickness 48–24 h before the PGF2α treatment until 24 h after ovulation (ovulation = Day 0). In the natural estrus group, USG was performed every 48 h from Day 3 to Days 15–18 after the first ovulation, and then every 6 h until 24 h after ovulation. Endometrial thickness was standardized using Day 13 as a reference day. Blood was collected during every USG examination and plasma P4 and E2 concentrations were determined. Endometrial thickness of the induced estrus group (n = 11) was greater than that of the natural estrus group (n = 9) between 60 and 12 h before ovulation (P < 0.05). In the natural estrus group, prior to an increase in endometrial thickness, a decrease in P4 and an increase in E2 were detected. In the induced estrus group, based on the time of ovulation, an increase in endometrial thickness was detected at the same time of a decrease in P4 before an increase in E2. These results suggest that decreases in P4 concentrations may be a cue to changes in endometrial thickness, while increases in E2 concentrations appear to sustain and/or enhance these changes.
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