SECRETION OF GONADOTROPINS CHANGE DURING THE LUTEAL-PHASE OF THE BOVINE ESTROUS-CYCLE IN THE ABSENCE OF CORRESPONDING CHANGES IN PROGESTERONE OR 17-BETA-ESTRADIOL

被引：42

作者：

CUPP, AS ^{[1
]}

STUMPF, TT ^{[1
]}

KOJIMA, FN ^{[1
]}

WERTH, LA ^{[1
]}

WOLFE, MW ^{[1
]}

ROBERSON, MS ^{[1
]}

KITTOK, RJ ^{[1
]}

KINDER, JE ^{[1
]}

机构：

[1] UNIV NEBRASKA,DEPT ANIM SCI,LINCOLN,NE 68583

来源：

ANIMAL REPRODUCTION SCIENCE | 1995年 / 37卷 / 02期

关键词：

CATTLE; ENDOCRINOLOGY; PROGESTERONE; ESTRADIOL; LH; FSH; ESTRUS CYCLE DYNAMICS;

D O I：

10.1016/0378-4320(94)01333-H

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

The hypothesis in the present study was that changes in circulating luteinizing hormone (LH) and follicle stimulating hormone (FSH) would occur during the luteal phase of the oestrous cycle (Days 4-19; Day 0, day of behaviourial oestrus) that were not related to corresponding changes in concentrations of progesterone and 17 beta-oestradiol. The stage of the oestrous cycle of cows (n = 18) was synchronised to obtain cows that were on alternate days of the cycle. Blood samples were collected every other day at 15 min intervals for 12 h from all cows: Days 4, 6, 8, 10, 12, 14, 16, 18 (n=9) and Days 5, 7, 9, 11, 13, 15, 17, 19 (n = 9). Concentrations of LH, FSH, 17 beta-oestradiol and progesterone were determined in these samples. Data were compared across days to determine when significant changes occurred in concentrations or patterns of secretion of the gonadotrophins and ovarian steroid hormones during the oestrous cycle. There were significant changes in mean concentrations of FSH in circulation between Days 6 and 12. The most striking changes in secretion of gonadotrophins that could not be explained by changes in gonadal steroids were the fluctuations in amplitude of LH pulses between Days 7 and 12. Amplitude of LH pulses increased between Days 7 and 11 and subsequently decreased between Days 11 and 12 of the oestrous cycle. Some changes in gonadotrophin secretion that occurred in the present study can be explained by fluctuations in concentrations of progesterone and 17 beta-oestradiol in circulation. Other changes cannot be explained by fluctuations in circulating concentrations of these steroids. We accept our hypothesis because the concomitant changes in mean concentration of FSH between Days 6 and 11 and amplitude of LH pulses between Days 7 and 12 of the bovine oestrous cycle cannot be explained by changes in circulating concentrations of progesterone and 17 beta-oestradiol.

引用

页码：109 / 119

页数：11

共 21 条

[1] NURSING ENHANCES THE NEGATIVE EFFECT OF ESTROGEN ON LH-RELEASE IN THE COW [J].