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The Mode of Production of Twins in Sheep

University of Minnesota

Abstract

Twinning in sheep is a phenomenon of considerable interest to both practical sheepmen and embryologists. To the former it will always be of economic importance; to the latter an interesting and very fertile source of study in a comparatively new science. With the increase in our knowledge of the mechanics of reproduction our interest in twinning has received greater impetus. In this respect the field of human embryology has produced numerous observations on the problem.

It is a well established fact that twinning may occur as the result of either of two distinct processes; firstly, monozygotic twins resulting from the splitting of a single fertilized egg; or, secondly, dizygotic twins resulting from the fertilization of two distinct ova. Does twinning in sheep involve both types of twins? If both types occur, does one type have a greater incidence than the other? In this paper an attempt is made to present statistical proof that in sheep we are dealing almost exclusively with twins of dizygotic origin.