NDLI: 13,14-Dihydro-15-keto prostaglandin F2 release in response to oxytocin challenge early post-partum in anoestrous Nelore cows submitted to temporary calf removal and progesterone priming.

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13,14-Dihydro-15-keto prostaglandin F2 release in response to oxytocin challenge early post-partum in anoestrous Nelore cows submitted to temporary calf removal and progesterone priming.

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13,14-Dihydro-15-keto prostaglandin F2 release in response to oxytocin challenge early post-partum in anoestrous Nelore cows submitted to temporary calf removal and progesterone priming.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Satrapa, R. A. Pinheiro, V. G. Ereno, R. L. Membrive, C. M. B. Piagentini, M. Binelli, M. Barros, C. M.
Description	Country affiliation: Brazil Author Affiliation: Satrapa RA ( Department of Animal Reproduction, University of Sao Paulo State, Botucatu, Sao Paulo, Brazil.)
Abstract	The study evaluated, in early post-partum anoestrous Nelore cows, if the increase in plasma oestradiol (E2) concentrations in the pre-ovulatory period and/or progesterone priming (P4 priming) preceding ovulation, induced by hormonal treatment, reduces the endogenous release of prostaglandin PGF(2) and prevents premature lysis of the corpus luteum (CL). Nelore cows were subjected to temporary calf removal for 48 h and divided into two groups: GPE/eCG group (n = 10) and GPG/eCG group (n = 10). Animals of the GPE/eCG group were treated with a GnRH agonist. Seven days later, they received 400 IU of eCG, immediately after PGF(2) treatment, and on day 0, 1.0 mg of oestradiol benzoate (EB). Cows of the GPG/eCG group were similarly treated as those of the GPE/eCG group, except that EB was replaced with a second dose of GnRH. All animals were challenged with oxytocin (OT) 9, 12, 15 and 18 days after EB or GnRH administration and blood samples were collected before and 30 min after OT. Irrespective of the treatments, a decline in P4 concentration on day 18 was observed for cows without P4 priming. However, animals exposed to P4 priming, treated with EB maintained high P4 concentrations (8.8 ± 1.2 ng/ml), whereas there was a decline in P4 on day 18 (2.1 ± 1.0 ng/ml) for cows that received GnRH to induce ovulation (p < 0.01). Production of 13,14-dihydro-15-keto prostaglandin F(2) (PGFM) in response to OT increased between days 9 and 18 (p < 0.01), and this increase tended to be more evident in animals not exposed to P4 priming (p < 0.06). In conclusion, the increase in E2 during the pre-ovulatory period was not effective in inhibiting PGFM release, which was lower in P4-primed than in non-primed animals. Treatment with EB promoted the maintenance of elevated P4 concentrations 18 days after ovulation in P4-primed animals, indicating a possible beneficial effect of hormone protocols containing EB in animals with P4 priming.
File Format	HTM / HTML
ISSN	09366768
Issue Number	5
Volume Number	45
e-ISSN	14390531
Journal	Reproduction in Domestic Animals
Language	English
Publisher	Wiley
Publisher Date	2010-10-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Reproductive Medicine Discipline Veterinary Medicine Discipline Zoology Cattle Physiology Dinoprost Analogs & Derivatives Fertility Agents, Female Pharmacology Oxytocin Progesterone Animals Metabolism Female Administration & Dosage Ovulation Drug Effects Postpartum Period Journal Article Randomized Controlled Trial
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Endocrinology Biotechnology

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