Abstract
This chapter contains section titled: Early Embryonic Mortality in Domestic Animals Fecundability and Embryonic Mortality in Man How do Chromosomal Abnormalities Produce Abortion? Conclusions References Discussion References Final General Discussion Is there Maternal Recognition of Pregnancy Before Implantation? Signals in Ectopic Pregnancy Progesterone Metabolism in Early Pregnancy Uterine Secretion of Prostaglandins Specific Uterine Proteins in Pregnancy References