Results 181 to 190 of about 8,097 (247)

Endogenous and exogenous effects of PGF2α during luteolysis in mares.

Theriogenology, 2019
An inhibitor of PGF2α biosynthesis (flunixin meglumine, FM) was used to study the role of endogenous PGF2α on the luteolytic effect of exogenous PGF2α in mares. A 2-h infusion of PGF2α at a constant rate (total dose, 0.1 mg) on Day 10 (ovulation = Day 0)
O. J. Ginther, R. Domingues, V. Kennedy, S. Dangudubiyyam   +3 more
semanticscholar   +1 more source

Studies on Prostaglandin and Luteolysis in the Pseudopregnant Rabbit

Endocrine Research, 1990
The ability of pulsatile infusion of prostaglandin F2 alpha (PGF2 alpha) or 13, 14-dihydro prostaglandin F2 alpha to induce corpus luteum regression was examined in the pseudopregnant rabbit. Each prostaglandin was infused in 5, 1-hour pulses (1 per 6 hours) during a 25-hour period starting day 9 or 10 of pseudopregnancy.
J C, Carlson, P, Hahn, K, So, A, Chan
openaire   +2 more sources

Induction of luteolysis by dihydrotestosterone in the pregnant rat

American Journal of Physiology-Endocrinology and Metabolism, 1981
A dihydrotestosterone (DHT) pellet (4 mg) inserted under each ovarian bursa on day 9 of pregnancy induced within 24 h, a 40% decline in serum progesterone (P) concentrations in rats; a further reduction was observed on days 12 and 15. Although P levels were significantly reduced by DHT treatment, fetuses remained alive on day 12.
R, Sridaran, G, Gibori
openaire   +2 more sources

Luteolysins and Mechanisms of Luteolysis

1987
A fundamentally important event in reproduction is luteolysis because without a decrease in progesterone secretion, there can be no gonadotropin-dependent ovarian differentiation and cyclic function. Until the last two decades, virtually nothing was known of the mechanisms of luteolysis or of the agents that regulate such processes.
H. R. Behrman, R. F. Aten, J. J. Ireland, L. K. Soodak, J. R. Pepperell, B. Musicki   +5 more
openaire   +1 more source

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.
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +3 more sources

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
openaire   +2 more sources

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.
openaire   +2 more sources