Luteal Function and Follicular Growth Following Follicular Aspiration During the Peri-Luteolysis Period in Bos indicus and Crossbred Cattle

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorBisinotto, R. S.
dc.creatorIbiapina, B. T.
dc.creatorPontes, E. O.
dc.creatorBertan, C. M.
dc.creatorSatrapa, R.
dc.creatorBarros, C. M.
dc.creatorBinelli, M.
dc.date2014-05-20T15:33:26Z
dc.date2016-10-25T18:09:59Z
dc.date2014-05-20T15:33:26Z
dc.date2016-10-25T18:09:59Z
dc.date2012-04-01
dc.date.accessioned2017-04-06T00:32:55Z
dc.date.available2017-04-06T00:32:55Z
dc.identifierReproduction In Domestic Animals. Malden: Wiley-blackwell, v. 47, n. 2, p. 319-327, 2012.
dc.identifier0936-6768
dc.identifierhttp://hdl.handle.net/11449/42048
dc.identifierhttp://acervodigital.unesp.br/handle/11449/42048
dc.identifier10.1111/j.1439-0531.2011.01875.x
dc.identifierWOS:000301534200026
dc.identifierhttp://dx.doi.org/10.1111/j.1439-0531.2011.01875.x
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/884715
dc.descriptionFollicular 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 survival. Objectives were to evaluate follicular dynamics, plasma concentrations of estradiol and luteal lifespan in Bos indicus and crossbred cows subjected to sequential follicular aspirations. From D13 to D25 of a synchronized cycle (ovulation = D1), Nelore or crossbred, non-pregnant and non-lactating cows were submitted to daily ultrasound-guided aspiration of follicles >6 mm (n = 10) or to sham aspirations (n = 8). Diameter of the largest follicle on the day of luteolysis (7.4 +/- 1.0 vs 9.7 +/- 1.0 mm; mean +/- SEM), number of days in which follicles >6 mm were present (2.3 +/- 0.4 vs 4.6 +/- 0.5 days) and daily mean diameter of the largest follicle between D15 and D19 (6.4 +/- 0.2 vs 8.5 +/- 0.3 mm) were smaller (p < 0.01) in the aspirated group compared with the control group, respectively. Aspiration tended to reduce (p < 0.10) plasma estradiol concentrations between D18 and D20 (2.95 +/- 0.54 vs 4.30 +/- 0.55 pg/ml). The luteal lifespan was similar (p > 0.10) between the groups (19.6 +/- 0.4 days), whereas the oestrous cycle was longer (p < 0.01) in the aspirated group (31.4 +/- 1.2 vs 21.2 +/- 1.3 days). Hyperechogenic structures were present at the sites of aspiration and were associated with increase in concentration of progesterone between luteolysis and oestrus. It is concluded that follicular aspiration extended the oestrous cycle and decreased the average follicular diameter on the peri-luteolysis period but failed to delay luteolysis.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languageeng
dc.publisherWiley-Blackwell
dc.relationReproduction in Domestic Animals
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.titleLuteal Function and Follicular Growth Following Follicular Aspiration During the Peri-Luteolysis Period in Bos indicus and Crossbred Cattle
dc.typeOtro


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