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Seventy six ewes were treated with 7.5, 12.5, 25 or 50μg of cloprostenol on day 6 or 9 post-estrus to compare the luteolytic efficiency of the PGF2α analogue at each stage and to evaluate if progesterone concentrations at the time of treatment affect such efficiency. Blood samples were obtained before cloprostenol administration and 12, 24, 48, and 72h thereafter. There was an effect of dose (p<0...