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Nine groups of pony mares (3/group) were used in a 3 × 3 factorial experiment. The factors were dose of PGF2α (0, 0.25 or 1.25 mg) and route of administration (im, iu or il). Mares were lapa-rotomized and treated on day 7 postovulation. Jugular blood was collected for progesterone RIA at 0 (pretreatment) and 1, 6, 12, 24, 48 and 72 hr posttreatment.
Douglas et al. (Wed,) studied this question.