Results 121 to 130 of about 7,496 (181)

Luteolysis in early diestrous beagle bitches

Theriogenology, 1988
To induce luteolysis early in diestrus, 15 mated beagles were treated with 250 microg/kg prostaglandin F2alpha (PG), administered subcutaneously twice daily for 4 d, from Day 5 to Day 8 after the onset of cytological diestrus. They were divided into three groups of five bitches each: Group 1 received PG only.
A Marais
exaly   +3 more sources

The transition between preluteolysis and luteolysis in cattle

Theriogenology, 2011
Novel characterization of the transition between preluteolysis and luteolysis was done in seven heifers. Blood samples were collected hourly and assayed for progesterone (P4), 13-14-dihydro-15-keto-PGF2α (PGFM), and estradiol (E2). The peaks of P4 oscillations were used to designate the transitional hour in each heifer.
O J Ginther, H K Shrestha, M A Beg
exaly   +3 more sources

Luteolysis

2018
Joy L Pate
exaly   +2 more sources

Immunoregulation of luteolysis

Medical Hypotheses, 1988
It is proposed that the immune/inflammatory system plays a yet unrecognized role in the mechanics of prostaglandin (PG) F2 alpha-induced luteal regression. Eosinophils are specifically attracted into luteal tissues and activated to degranulate (i.e. secrete cytotoxins) before symptoms of luteolysis are manifested (sheep).
W J, Murdoch, L E, Steadman, E L, Belden
openaire   +2 more sources

ESTROGEN-INDUCED HUMAN LUTEOLYSIS

Obstetrical & Gynecological Survey, 1973
Diethylstilbestrol diphosphate (50 mg daily for 5 days) was given to 3 women for 5 treatment cycles beginning on the third day following the rise in basal body temperature. Daily plasma samples were obtained for radioimmunoassay of progesterone levels. In k treated cycles, a luteolytic effect was apparent by the third day of treatment.
B Z, Gore, B V, Caldwell, L, Speroff
openaire   +2 more sources

Luteolysis: A Neuroendocrine-Mediated Event

Physiological Reviews, 1999
In many nonprimate mammalian species, cyclical regression of the corpus luteum (luteolysis) is caused by the episodic pulsatile secretion of uterine PGF2α, which acts either locally on the corpus luteum by a countercurrent mechanism or, in some species, via the systemic circulation.
J A, McCracken, E E, Custer, J C, Lamsa
openaire   +2 more sources

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

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

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