02954naa a2200505 a 450000100080000000500110000800800410001902400590006010000190011924501390013826000090027752014730028665000200175965000270177965000090180665000180181565000170183365000100185065000190186065000180187965000110189765000100190865000170191865000270193565000200196265000310198265300340201365300300204765300090207765300250208665300220211165300200213365300250215370000180217870000200219670000230221670000250223970000200226470000270228470000170231170000180232870000220234670000200236877300600238821879652026-07-02       2026    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1016/j.anireprosci.2026.1082322DOI1 aMARTINS, B. B.  aRecombinant FSH as an alternative to pituitary-extracted FSH for superovulation and embryo production in sheep.h[electronic resource]  c2026  aAbstract: The aim of this study was to compare recombinant bovine FSH (rbFSH) with a conventional multiple-dose purified porcine FSH (pFSH) for in vivo embryo production in sheep. Forty multiparous Santa Inês ewes were randomly assigned to two groups: the GPUR group received 333 IU of pFSH in six decreasing doses at 12-hour intervals; the GREC group received a single 100 μg dose of rbFSH. Both groups underwent SOV following a short estrous synchronization protocol and were naturally mated. Estrus tended to last longer in GPUR than GREC ewes (44.5 ± 3.9 h vs. 35.6 ± 3.9 h; P = 0.08). No significant differences were observed between GPUR and GREC groups regarding estrus incidence (100% - GPUR vs. 95% - GREC), interval to estrus onset (66.9 ± 2.3 h – GPUR vs. 65.0 ± 2.4 h – GREC), number of CL (8.3 ± 1.1 – GPUR vs. 6.3 ± 1.1 – GREC), recovered structures (3.1 ± 0.8 – GPUR vs. 1.9 ± 0.9 – GREC), or viable embryos (1.2 ± 0.8 – GPUR vs. 1.7 ± 0.8 – GREC) whereas, the use of rbFSH reduced the incidence of anovulatory follicles (1.3 ± 0.5 – GPUR vs. 0.3 ± 0.5 – GREC; P = 0.04). The use of rbFSH did not result in differences in ovarian stimulation response in hair sheep, although rbFSH reduced the incidence of anovulatory follicles. Considering that it greatly simplifies on-farm procedures, it may represent a practical alternative for use in SOV in sheep.  aEmbryo transfer  aEstrus synchronization  aEwes  aGonadotropins  aReproduction  aSheep  aSuperovulation  aGonadotrofina  aOvelha  aOvino  aReprodução  aSincronização do Cio  aSuperovulação  aTransferência de Embrião  aBiotecnologia da reprodução  aFolículos anovulatórios  aMOET  aProtocolos hormonais  aRaça Santa Inês  aRecombinant FSH  aResposta ovulatória1 aARRAIS, A. M.1 aPINTO, P. H. N.1 aPLAZA, M. P. da C.1 aMAIA, P. H. de M. C.1 aSILVA, S. R. da1 aSOUZA-FABJAN, J. M. G.1 aMENCHACA, A.1 aUNGERFELD, R.1 aFONSECA, J. F. da1 aBRANDÃO, F. Z.  tAnimal Reproduction Sciencegv. 291, 108232, Aug. 2026.