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The plural is corpora lutea. The corpus luteum produces progesterone. After ovulation, there are several corpora lutea present and they will produce progesterone, again whether or not the dog actually got pregnant.How long does the corpus luteum last in a horse?
A prolonged period of luteal activity may also follow formation of a luteinized anovulatory follicle. The corpus luteum may persist for 2 to 3 months, during which time the mare will not express behavioral estrus.How is persistent corpus luteum (CL) diagnosed?
Diagnosis of a persistent corpus luteum may be made by behavioral observations, palpation, ultrasonography, analysis of plasma progesterone concentrations, or clinical response to prostaglandin administration. Progesterone concentrations greater than 1.0 ng/ml are indicative of the presence of luteal activity.