Follicular wave emergence in Santa Inês ewes subjected to long-term, progesterone-based estrous synchronization protocols at different times of the year
| Autor: | J. F. Fonseca, H. Ayres, W. R. R. Vicente, Eunice Oba, M. E. F. Oliveira, Sony Dimas Bicudo, Pawel M. Bartlewski, Rami T. Kridli, Luís Guilherme de Oliveira |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp), Universidade de São Paulo (USP), Univ Guelph, Jordan Univ Sci & Technol, Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) |
| Rok vydání: | 2016 |
| Předmět: |
endocrine system
medicine.medical_specialty Photoperiod media_common.quotation_subject Superovulation Biology Ewe Andrology 03 medical and health sciences Follicular dynamics 0302 clinical medicine Endocrinology Ovarian Follicle Food Animals Internal medicine Follicular phase medicine Animals Ovulation Progesterone Prostaglandin f media_common Estrous cycle Sheep 030219 obstetrics & reproductive medicine business.industry 0402 animal and dairy science Estrus synchronization 04 agricultural and veterinary sciences General Medicine Antral follicle 040201 dairy & animal science Female Animal Science and Zoology Seasons Ultrasonography Estrus Synchronization business |
| Zdroj: | Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 0378-4320 |
| DOI: | 10.1016/j.anireprosci.2016.09.008 |
| Popis: | Made available in DSpace on 2018-11-26T17:10:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-11-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Jordan University of Science and Technology This study was conducted to document the pattern of antral follicular wave emergence throughout the 14-day, progesterone (P-4)-based estrous synchronization protocol in ewes that were maintained in subtropical conditions, during the period of increasing day lengths (ID), decreasing day lengths (DD), and the transitional period (TP). In addition, the influence of ovarian status (i.e., size of ovarian antral follicles and the presence of corpora lutea) at the outset of P-4 treatment on ensuing ovarian follicular wave development was examined. Sexually mature Santa Ines ewes (n =70) were subjected to one of the two estrous synchronization protocols in the three seasons. On Day 0, the ewes received an i.m. injection of prostaglandin F-2 alpha and an intravaginal P4-releasing device that remained in place for 14days (G-1CIDR) or was replaced on Day 7 (G-2CIDR). Daily ultrasonography of ovaries was conducted from Days 0 to 15. Mean (+/- SEM) numbers of follicular waves per ewe were 3.7 +/- 0.1 and 3.6 +/- 0.1 for G-1CIDR and G-2CIDR (P > 0.05). The number of emerging follicular waves was greater (P |
| Databáze: | OpenAIRE |
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