endometrial explants were removed from uteri of animals pregnant and pseudopregnant ( 5 mg oestradiol valerate on days 11 -- 15 ) for 60 days , from the gravid and non-gravid horns of unilaterally pregnant pigs at day 60 of pregnancy and fron non-pregnant animals at day 12 of the oestrous cycle .
C0042149
uteri
C0025329
oestrous cycle