00908naa a2200193 a 450000100080000000500110000800800410001910000170006024501180007726000090019552003660020465000170057065000100058765000150059765000170061265000100062965000170063977300580065615231672023-11-07       1934    bl uuuu     u00u1 u    #d1 aCLARK, R. T.  aStudies on the physiology of reproduction in the sheep. II. The cleage stages of the ovum.h[electronic resource]  c1934  aIn this paper the stages up to and slightly beyond the period of implantation are described. Embryological evidence is presented regbarding the relatively rare occurrence of mono zygotic twinnig in sheep. Thisevidence substantiates the statistical data referred to in the first paper of this series, which indicated that twins in sheep were of dizygotic origin.  aReproduction  aSheep  aFisiologia  aObstetrícia  aOvino  aReprodução  tThe Anatomical Recordgv. 60, n. 2, p. 135-159, 1934.