progesterone (p4), estradiol (e2) and luteinizing hormone (lh) concentrations during synchronized estrous cycle using prostaglandin (pgf2 ) in sheep were studied. ewes were randomly divided in two groups (n=7/group): t1 synchronized with two injections of pg, given 7 days apart, and t2, female showing natural estrous. blood samples were collected from one day before pg and during experiment for steroidal determination. for profile of luteinizing hormone (lh) pulses, blood samples were collected at 30-min intervals for a period of 8h on days one, six and 12. hormonal concentrations were determined by radioimmunoassay. mean concentrations of p4 (p
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