The Effect of Corpora Lutea Induced During Pregnancy on the Length of Gestation in the Pig

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Abstract
When corpora lutea (CL) were induced in pregnant gilts on day 83 or day 103, and the original CL were removed 6 days later, pregnancy was maintained. CL induced on day 83 had no effect on the length of gestation, and remained functional for 30 days rather than 15 days, as do the CL of the estrous cycle, or 114 days, as do CL of gestation. CL induced on day 102 remained functional for 15 days and prolonged gestation significantly beyond the usual 114 days. Induced CL in pregnant gilts apparently do not function for 114 days, but do function for a minimum of 15 days, as do CL of the estrous cycle; whatever factors normally cause CL to regress on day 114 are ineffective in CL less than 15 days of age.