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Kaplan-Meier survival curves for the probability of pregnancy survival after pregnancy diagnosis at 37 ± 3 d of gestation in different parities (A; n = 1,644) or only in heifers (B; n = 928), primiparous (C; n = 499), or multiparous (D; n = 217) cows not treated (control) or treated with GnRH or human chorionic gonadotropin (hCG) immediately before embryo transfer.
