02574naa a2200421 a 450000100080000000500110000800800410001902400270006010000200008724501150010726000090022252013790023165000240161065000140163465000100164865000200165865000170167865000100169565000150170565000240172065000270174465300240177165300190179565300240181465300290183865300220186765300200188965300250190965300140193470000220194870000170197070000210198770000160200870000120202470000140203670000200205077300820207020197842016-03-04       2015    bl uuuu     u00u1 u    #d7 a10.1111/rda.125432DOI1 aFIQUEIRA, L. M.  aColour Doppler ultrasonography as a tool to assess luteal function in santa Inês ewes.h[electronic resource]  c2015  aAbstract: The aim of this study was to evaluate luteal dynamics in the Santa Inês ewes using colour Doppler (CD) ultrasonography. Oestrus was synchronized in nulliparous females (n = 18), and subsequently, they were only teased (n = 6) or teased and mated (n = 12). Blood samples were collected daily for plasma progesterone (P4 ) concentrations. Ultrasonographic images of corpora lutea (CL) in CD mode were obtained for further analysis in its largest diameter. The CD mode allowed an early sequential monitoring of CL that was visualized by the first time 0.77 ± 0.62 days after ovulation, with luteal area 29.68 ± 13.21 mm2 . During the luteogenesis, a progressive increase was observed, followed by a plateau of luteal area, vascularization area and plasma concentrations of P4 reaching maximum values in D11 (124.0 ± 38.0 mm2 , 52.78 ± 24.08 mm2 and 11.23 ± 4.89 ng/ml, respectively). In the luteolysis, the plasma concentrations of P4 decreased sharply, whereas luteal and vascularization area gradually. The vascularization area was positively correlated with plasma concentrations of P4 during the luteogenesis (r = 0.22) and luteolysis (r = 0.48). The luteal dynamics of Santa Inês ewes showed patterns similar to those observed in other sheep breeds studied. The CD ultrasonography has the potential to be used as a tool to assess luteal function in sheep.  aAnimal reproduction  aOvulation  aSheep  aUltrasonography  aCiclo estral  aOvino  aOvulação  aReprodução animal  aSincronização do cio  aDinâmica folicular  aOestrous cycle  aPlasma progesterone  aProgesterona plasmática  aRaça Santa Inês  aSynchronization  aSynchronized females  aUltra-Som1 aFONSECA, J. F. da1 aARASHIRO, E.1 aSOUZA-FABJAN, J.1 aRIBEIRO, A.1 aOBA, E.1 aVIANA, J.1 aBRANDÃO, F. Z.  tReproduction in Domestic Animals, Berlingv. 50, n. 4, p. 643-650, May, 2015.