Abstract
The concept of the maternal recognition of pregnancy in farm animals is discussed with emphasis on the transmission of a signal from the conceptus to the mother. Work on the pig has revealed that pre-attachment blastocyst tissue acquires the ability to synthesize hormonal steroids, and their physiological role is discussed in terms of the transformation of ovarian activity, the mechanism of attachment and embryonic protein synthesis. Parallel studies on the establishment of pregnanoy in the sheep and cow are briefly reviewed. In the cow a laboratory test of pregnancy in thie third week after insemination based on progesterone levels in milk has revealed that pregnancy failure is often due to embryonic death during the preattachment period.
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