The induction of earlier breeding activity in sheep. A comparison between the use of vasectomised rams and the use of intravaginal pessaries impregnated with a new progestin.
D000818:Animals; D001947:Breeding; D005260:Female; D008297:Male; D010570:Pessaries; D011247:Pregnancy; D011372:Progestins / Q000008:administration & dosage*; D012756:Sheep; D014649:Vas Deferens / Q000601:surgery
D011372:Progestins