02470naa a2200301 a 450000100080000000500110000800800410001902400410006010000210010124501550012226000090027752015160028665000220180265000120182465000230183665000110185965300120187070000250188270000270190770000250193470000230195970000210198270000200200370000250202370000220204870000200207077300780209021025082022-08-09       2018    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1071/rd173372DOI1 aBRAGANÇA, G. M.  aDose and administration protocol for FSH used for ovarian stimulation affect gene expression in sheep cumulus-oocyte complexes.h[electronic resource]  c2018  aThe present study evaluated the effect of four ovarian stimulation protocols on the follicular population and molecular status of cumulus-oocyte complexes (COCs). Twelve Santa Inês ewes (in a cross-over design) received 80 or 120mg FSH alone in a multiple-dose (MD80 and MD120) regimen or in combination with 300IU equine chorionic gonadotrophin (eCG) in a one-shot (OS80 and OS120) protocol. The follicular population, COC recovery rate, mean COCs per ewe and the rate of brilliant Cresyl blue-positive (BCB+) COCs were similar among treatments (P&gt0.05). The expression of markers of oocyte competence (ZAR1, zygote arrest 1; MATER, maternal antigen that embryo requires; GDF9, growth differentiation factor 9; BMP15, bone morphogenetic protein 15; Bcl-2, B-cell lymphoma 2; BAX, Bcl-2 associated X protein) and the steroidogenic pathway (ER?, oestrogen receptor ?; LHr, LH receptor; FSHr, FSH receptor; STAR, steroidogenic acute regulatory protein) was affected by stimulation. Specifically, the expression of markers of the steroidogenic pathway was reduced with increasing FSH dose in the OS protocol. FSH at a dose of 80mg reduced the expression of FSHr and ER? in the OS versus MD protocol. Conversely, in MD protocol, only LHr was affected by increasing FSH dose. In conclusion, 80mg FSH in the MD or OS protocol was sufficient to promote the development of multiple follicles and obtain fully grown (BCB+) oocytes. The MD protocol may be more appropriate for the production of better-quality oocytes.  aMolecular biology  aOocytes  aBiologia Molecular  aOvelha  aOócito1 aBATISTA, R. I. T. P.1 aSOUZA-FABJAN, J. M. G.1 aALFRADIQUE, V. A. P.1 aARASHIRO, E. K. N.1 aCOSENTINO, I. O.1 aPINTO, P. H. N.1 aCAMARGO, L. S. de A.1 aFONSECA, J. F. da1 aBRANDÃO, F. Z.  tReproduction, Fertility and Developmentgv. 30, n. 9, p. 1234-1244, 2018.