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Partial luteolysis during early diestrus in cattle downregulates VEGFA expression and reduces large luteal cell and corpus luteum sizes and plasma progesterone concentration
(2020-12-01)
Our objectives were to investigate potential changes in the size of steroidogenic large luteal cells (LLC) during partial luteolysis induced by a sub-dose of cloprostenol in early diestrus and to determine transcriptional ...
Luteal Function and Follicular Growth Following Follicular Aspiration During the Peri-Luteolysis Period in Bos indicus and Crossbred Cattle
(Wiley-Blackwell, 2012-04-01)
Follicular estradiol triggers luteolysis in cattle. Therefore, the control of follicle growth and steroidogenesis is expected to modulate luteal function and might be used as an anti-luteolytic strategy to improve embryo ...
Oestrogen, Progesterone and Oxytocin Receptors and COX-2 Expression in Endometrial Biopsy Samples from the Induction of Ovulation to Luteolysis in Llamas (Lama glama)
(Wiley-blackwell Publishing, Inc, 2013-02)
Endometrial expression of oestrogen (ERa), progesterone (PR) and oxytocin receptor (OR) and cyclooxygenase-2 (COX-2) was evaluated from the induction of ovulation to luteolysis in llamas. Ovarian activity was daily ...
The physiology and impact on fertility of the period of proestrus in lactating dairy cows
(Brazilian Coll Animal Reproduction, 2014-07-01)
In cattle, proestrus begins with the initiation of luteolysis and ends with initiation of estrus and the GnRH/LH surge. This period is marked by a dramatic decrease in circulating progesterone (P4) that reaches a nadir by ...
The physiology and impact on fertility of the period of proestrus in lactating dairy cows
(2014-01-01)
In cattle, proestrus begins with the initiation of luteolysis and ends with initiation of estrus and the GnRH/LH surge. This period is marked by a dramatic decrease in circulating progesterone (P4) that reaches a nadir by ...
Maintenance or regression of the corpus luteum during multiple decisive periods of bovine pregnancy
(Brazilian Coll Animal Reproduction, 2016-07-01)
In ruminants, there are specific times during the estrous cycle or pregnancy when the corpus luteum (CL) may undergo regression. This review has attempted to summarize the physiological and cellular mechanisms involved in ...
Direct effect of PGF2 alpha pulses on PRL pulses, based on inhibition of PRL or PGF2 alpha secretion in heifers
(ELSEVIER SCIENCE INCNEW YORK, 2012)
The relationships between PRL and PGF(2 alpha) and their effect on luteolysis were studied. Heifers were treated with a dopamine-receptor agonist (bromocriptine; Bc) and a Cox-1 and -2 inhibitor (flunixin meglumine [FM]) ...
Alternative low doses and routes of administering a prostaglandin F2 alpha analogue to induce luteolysis in Nelore cows
(Korean Society Veterinary Science, 2006-12-01)
The present study was conducted in order to verify the efficacy of lower doses and alternative routes of a prostaglandin F2 alpha analogue, luprostiol (PGF), for the induction of luteolysis and the precipitation of estrus ...
Luteal changes after treatment with sub-luteolytic doses of prostaglandin (cloprostenol sodium) in cattle
(Elsevier B.V., 2015-02-01)
This study characterizes the physiological and morphological changes related to partial luteolysis in bovine corpus luteum (CL) after challenges with sub-doses of cloprostenol sodium on Day 6 (D6) of the estrous cycle. ...
Impact of estradiol cypionate prior to TAI and progesterone supplementation at initial diestrus on ovarian and fertility responses in beef cows
(Elsevier B.V., 2017-12-01)
In cattle, early diestrus progesterone (P4) supplementation modulates endometrial function to exert pro and anti-pregnancy establishment effects; specifically, P4 stimulates conceptus growth, but also induces early onset ...