02144naa a2200277 a 450000100080000000500110000800800410001902400540006010000310011424501250014526000090027052013240027965000090160365000170161265000200162965000100164965000100165965000170166965300120168665300170169865300220171570000200173770000170175770000210177477300710179515202732023-05-17       1991    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1016/0168-1591(91)90137-M2DOI1 aRODRÍGUEZ IGLESIAS, R. M.  aImportance of behavioural stimuli in raminduced ovulation in seasonally anovular corriedale ewes.h[electronic resource]  c1991  aAbstract: Three groups of about 65 seasonally anovular Corriedale ewes were penned and exposed to rams on November 4, 1989. A fourth group (n=64) was maintained in a 3-ha paddock and also exposed to rams on the same date. The sexual behaviour exhibited by rams in contact with penned ewes was recorded during nine simultaneous observation sessions lasting 2 h each. Five days after ram introduction, incidence of ovulation and ovulation rate were higher (P &lt 0.01) in adult than in 1.5-year-old ewes. Among penned adult ewes, a greater (P &lt 0.05) incidence of ovulation was recorded in ewes maintained in contact with rams and oestrous ewes (95.8%) than in ewes exposed to either rams with or without recent experience with oestrous ewes (68.7 and 57.1%, respectively). The fourth group, exposed to rams in field conditions, exhibited a lower (P &lt 0.05) incidence of ovulation (31.9%) than any other group. No differences among treatments were detected in 1.5-year-old ewes. The incidence of ovulation was associated (r=0.99, P&lt0.05) with the sexual behaviour displayed by the rams. It was concluded that the sexual behaviour of the rams plays an important role in ram-induced ovulation and that the continuous presence of oestrous ewes is necessary for the maximum efficacy of the technique in Corriedale ewes.  aEwes  aReproduction  aSexual behavior  aSheep  aOvino  aReprodução  aAnestro  aEfeito macho  aInduced ovulation1 aCICCIOLI, N. H.1 aIRAZOQUI, H.1 aRODRIGUEZ, B. T.  tApplied Animal Behaviour Sciencegv. 30, n. 3/4, p. 323-332, 1991.