SUMMARY A method is described for diagnosing the presence or absence of a conceptus soon after mating or insemination. It is applicable to a wide range of mammals and tests in the cow, sheep and pig have given an accuracy of approximately 90%. The method is based on the detection of a functional or regressed corpus luteum at a fixed time after mating by measuring the concentration of progesterone in peripheral blood. It is relatively simple to carry out.
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Robertson et al. (1971) studied this question.