Transuterine migration and embryo survival in sheep

Abstract

The results, based on two breeds of hill sheep, support the suggestion that viability of sheep embryos is reduced both by uterine crowding and by location in a uterine horn not associated with a CL. Despite this, the high frequency of transuterine migration, found when two CL are present in a single ovary, does enhance embryo survival. There may be some genetic influence on the frequency of such migration.