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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 ...
Effect of adding a gonadotropin-releasing-hormone treatment at the beginning and a second prostaglandin F-2 alpha treatment at the end of an estradiol-based protocol for timed artificial insemination in lactating dairy cows during cool or hot seasons of the year
(Elsevier B.V., 2015-02-01)
Our hypothesis was that fertility could be increased in a timed artificial insemination (TAI) protocol based on estradiol (E2) and progesterone (P4) by combining GnRH with E2-benzoate at the start of the protocol to increase ...
Elevated progesterone concentrations enhance prostaglandin F-2 alpha synthesis in dairy cows
(Elsevier B.V., 2009-08-01)
The objective was to evaluate the influence of varying plasma progesterone (P-4) concentrations throughout the luteal phase in dairy cows on PGF(2 alpha) production (assessed as plasma concentrations of 13,14-dihydro-15-keto-PGF(2 ...
Timed artificial insemination in beef cattle using GnRH agonist, PGF2alpha and estradiol benzoate (EB)
(Elsevier B.V., 2001-04-15)
The present work evaluated low-cost protocols for timed artificial insemination (TAI) in beef cattle. In Experiment 1, cycling nonlactating Nelore cows (Bos indicus, n=98) were assigned to the following groups: GnRH-PGF ...
Timed artificial insemination in beef cattle using GnRH agonist, PGF2alpha and estradiol benzoate (EB)
(Elsevier B.V., 2001-04-15)
The present work evaluated low-cost protocols for timed artificial insemination (TAI) in beef cattle. In Experiment 1, cycling nonlactating Nelore cows (Bos indicus, n=98) were assigned to the following groups: GnRH-PGF ...
Use of gnrh and pgf(2)alpha for synchronisation of oestrus in confined dairy herds
(UNIV AUSTRAL CHILE, FAC CIENCIAS VETERINARIAS, 1999)
The combination of GNRH and prostaglandin F(2)alpha allows the control of the luteal phase and the follicular dynamic that coexist in the ovary, facilitating precise oestrus synchronisation schemes. The study was intended ...