The aim of the present study was to evaluate the application of a GnRH-PGF based synchronization and superstimulation protocol for fixed-time natural mating in llama embryo donors. All females ( = 8) received 8 μg IM of GnRH analog (GnRHa; buserelin) on day 0, regardless of follicular status. After eight days, another GnRHa dose was administered followed by 250 μg IM PGF (cloprostenol).
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