Results 171 to 180 of about 3,713 (220)

Hormonal changes around bovine luteolysis

Prostaglandins, 1975
Plasma concentrations of estradiol-17beta, progesterone, LH and 13, 14-dihydro-15-keto-PGF2alpha were determined by radioimmunoassay on 2-hourly samples obtained around luteolysis and estrus in three dairy cows. The decline in progesterone occurred before the preestrous rise in estrogen and no pre-estrous peak of progesterone could be detected.
A J, Peterson, R J, Fairclough, E, Payne, J F, Smith   +3 more
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Cellular components involved in luteolysis

Journal of Animal Science, 1994
In the domestic species, regression of the corpus luteum is dependent on uterine release of prostaglandin (PG)F2 alpha. Despite the central role of PGF2 alpha in luteolysis, very little is known about the actual mechanism of prostaglandin-induced regression at the level of the luteal cell.
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Between prepartum luteolysis and onset of expulsion

Domestic Animal Endocrinology, 2002
In the cow the foetal endocrine signals that initiate the calving process result in prepartum luteolysis. Withdrawal of progesterone (P4) action is a prerequisite for a normal calving. The rather abrupt declining influence of P4 is followed by a cascade of physiological processes in the myometrium and cervix.
Taverne, M.A.M., Breeveld-Dwarkasing, V.N.A., van Dissel-Emiliani, F.M.F., Bevers, M.M., de Jong, R., van der Weijden, G.C.   +5 more
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Induction of luteolysis in the mare with a prostaglandin analogue

Theriogenology, 1974
Abstract Five mares were administered 0.5 to 2.0 mg of a prostaglandin analogue, RS 9390 (Syntex), during nine estrous cycles in February and March. Luteolysis as measured by peripheral plasma progesterone occurred in four cycles, transitory luteolysis following 0.5 mg RS 9390 in two cycles, while functional corpora lutea were not present in three ...
F N, Thompson, D M, Witherspoon
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Luteolysis in Mares After Endometrial Biopsy

American Journal of Veterinary Research, 1981
SUMMARY The length of diestrus was not changed in 4 mares by taking endometrial biopsy specimens during estrus. In contrast, taking endometrial biopsy specimens on postovulation day 4 induced premature luteolysis and significantly (P < 0.05) reduced the length of diestrus.
C B, Baker, D I, Newton, E C, Mather, W D, Oxender   +3 more
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Cellular Mechanisms Involved in Luteolysis

1979
Regression of the mammalian corpus luteum is commonly thought to involve autophagy (cellular self-digestion) or heterophagy (removal of cells by macrophages), or both. However, few studies have focused on these mechanisms, and their actual importance in luteolysis thus remains uncertain.
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Monocyte chemoattractant protein 1 in luteolysis

Reviews of Reproduction, 2000
Monocyte chemoattractant protein 1 (MCP-1) is a member of the chemokine family of cytokines which are involved in leukocyte physiology and trafficking. Interest in the role of inflammatory cells and their cytokine products in luteolysis has been increasing and there is mounting evidence demonstrating that MCP-1 is involved in luteolysis.
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Luteolysis in the hamster: Abrogation by gonadotropin and prolactin pretreatment

Prostaglandins, 1981
The luteolysis which terminated pseudopregnancy (PSP) in superovulated hamsters was studied. Spontaneous luteolysis occurred before 1100 on Day 7 of PSP and was characterized by a rapid decline in circulating progesterone levels. Luteolysis induced by prostaglandin F2 alpha (PGF2 alpha) on Day 5 of PSP displayed a similar rapid reduction in ...
K H, Harris, B D, Murphy
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A possible role for testosterone during luteolysis in the ewe

Research in Veterinary Science, 1988
Increased peripheral plasma concentrations of testosterone were detected at the commencement of luteolysis and at oestrus in sheep. Daily subcutaneous administration of spironolactone (10 mg kg-1) between days 10 and 16 of the oestrous cycle suppressed testosterone secretion and delayed luteolysis and oestrus.
R G, Cooke, K M, Benhaj
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Prostaglandins and post-abortion luteolysis in early pregnancy

Prostaglandins, 1975
This study was undertaken to determine if post-abortion luteolysis in early pregnancy could be accelerated by the administration of 15(S)15-methyl-PGF2alpha(15-me-PGF2alpha) or delayed following pretreatment with indomethacin. Thirty-nine women were divided into four groups: 7 women were given 400mug 15-me-PGF2alpha extra-amniotically one hour prior to
A, Leader, M, Bygdeman, S Z, Cekan, E, Diczfalusy, R, Guerrero, J N, Martin, N, Wiqvist   +6 more
openaire   +2 more sources