to test the endocrine-exocrine theory of maternal recognition of pregnancy in the pig 16 gilts were assigned randomly to a 2 x 2 factorial involving pretreatment with sesame oil ( so ) or estradiol valerate ( 5 mg ; ev ) injected on days 11 through 14 of the estrous cycle and an intrauterine injection of saline ( 5 ml ; sa ) or prostaglandin f2 alpha ( 50 micrograms ; pgf ) on day 14 .
C0032961
pregnancy
C0059623
estradiol valerate