on day 40 of gestation , mares were randomly assigned to one of three administration groups : 1 ) 250 mg of progesterone in oil every other day , 2 ) 22 mg of altrenogest ( regumate , american hoechst , somerville , nj 08876 ) orally every day , or 3 ) 10 ml of neobee oil ( control ) orally every day .
C0032961
gestation
C0033308
progesterone