Increasing the predictability of cloprostenol-induced farrowing in sows

Methods: Two experiments were conducted. In experiment 1, sows received one of two treatments: either a single IM injection of 175 μg cloprostenol at day 113 of gestation (n=49) or an IM injection of 175 μg cloprostenol at day 113 of gestation followed by second IM injection of 175 μg cloprostenol 6 hours later (n=54). In experiment 2, sows received either a single (n=59) or a double (n=48) cloprostenol injection, as above, or a third treatment in which an IM injection of 30 IU oxytocin (n=56) replaced the second cloprostenol injection.