Follicular dynamics and plasma FSH and progesterone concentrations during follicular deviation in the first post-ovulatory wave in Nelore (Bos indicus) heifers

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorCastilho, Caliê
dc.creatorGarcia, Joaquim M.
dc.creatorRenesto, Andrea
dc.creatorNogueira, Guilherme P.
dc.creatorBrito, Leonardo F. C.
dc.date2014-05-27T11:22:26Z
dc.date2016-10-25T18:23:43Z
dc.date2014-05-27T11:22:26Z
dc.date2016-10-25T18:23:43Z
dc.date2007-04-01
dc.date.accessioned2017-04-06T01:24:18Z
dc.date.available2017-04-06T01:24:18Z
dc.identifierAnimal Reproduction Science, v. 98, n. 3-4, p. 189-196, 2007.
dc.identifier0378-4320
dc.identifierhttp://hdl.handle.net/11449/69590
dc.identifierhttp://acervodigital.unesp.br/handle/11449/69590
dc.identifier10.1016/j.anireprosci.2006.03.008
dc.identifier2-s2.0-33847262103
dc.identifierhttp://dx.doi.org/10.1016/j.anireprosci.2006.03.008
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/890815
dc.descriptionThe objective of the present study was to characterize ovarian follicular dynamics and hormone concentrations during follicular deviation in the first wave after ovulation in Nelore (Bos indicus) heifers. Ultrasonographic exams were performed and blood samples were collected every 12 h from the day of estrus until 120-144 h after ovulation in seven females. Deviation was defined as the point at which the growth rate of the dominant follicle became greater than the growth rate of the largest subordinate follicle. Deviation occurred approximately 65 h after ovulation. Growth rate of the dominant follicle increased (P < 0.05) after deviation, while growth rate of the subordinate follicle decreased (P < 0.05). Diameter of the dominant follicle did not differ from the subordinate follicle at deviation (approximately 5.4 mm). The dominant follicle (7.6 mm) was larger (P < 0.05) than the subordinate follicle (5.3 mm) 96 h after ovulation or 24 h after deviation. Plasma FSH concentrations did not change significantly during the post-ovulatory period. The first significant increase in mean plasma progesterone concentration occurred on the day of follicular deviation. In conclusion, the interval from ovulation to follicular deviation (2.7 days) was similar to that previously reported in B. taurus females, but follicles were smaller. Diameters of the dominant follicle and subordinate follicle did not differ before deviation and deviation was characterized by an increase in dominant follicle and decrease in subordinate follicle growth rate. Variations in FSH concentrations within 12-h intervals were not involved in follicular deviation in Nelore heifers. © 2006 Elsevier B.V. All rights reserved.
dc.languageeng
dc.relationAnimal Reproduction Science
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCattle-estrous cycle
dc.subjectDominant ovarian follicle
dc.subjectFollicular deviation
dc.subjectFSH
dc.subjectNelore
dc.subjectfollitropin
dc.subjectprogesterone
dc.subjectanimal
dc.subjectblood
dc.subjectcattle
dc.subjectcomparative study
dc.subjectfemale
dc.subjectovary follicle
dc.subjectovulation
dc.subjectphysiology
dc.subjectAnimals
dc.subjectCattle
dc.subjectFemale
dc.subjectFollicle Stimulating Hormone
dc.subjectOvarian Follicle
dc.subjectOvulation
dc.subjectProgesterone
dc.subjectBos
dc.subjectBos indicus
dc.subjectBos taurus
dc.titleFollicular dynamics and plasma FSH and progesterone concentrations during follicular deviation in the first post-ovulatory wave in Nelore (Bos indicus) heifers
dc.typeOtro


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