Soto Vélez, Jay O.

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    Efecto de las hormonas oxitocina y pgf2α durante la inseminación artificial sobre la eficiencia reproductiva en cerdas
    (2007) Soto Vélez, Jay O.; Santana Nieves, Carmen S.; College of Agricultural Sciences; Pagán Morales, Melvin; Navas Almeyda, Vivian; Latorre Acevedo, José R.; Department of Animal Science; Muñoz, Carlos A.
    The effects of seminal supplementation with exogenous oxytocin or prostaglandin F2α (PGF2α) were evaluated on the reproductive performance of 33 Yorkshire or Landrace gilts during two seasons, high (> 77oF ) or low (≤ 77oF) average monthly air temperature. Eleven gilts received two dosis (10-12 hours apart) during the heat, of semen supplemented with 4ml of oxytocin, eleven of semen supplemented with 4ml of PGF2α and eleven were inseminated with no hormone supplemented in the semen. A second insemination was performed in those animals that repeated heat 21 days after the first service. The conception rate at the first or second heat was not significantly affected by treatment (P>0.1): the means for the first heat were 73.7, 45.5 and 54.6% for oxytocin, PGF2α and control respectively and for the second heat were 27.3% for oxytocin and control and 18.2% for PGF2α. However total conception rate (on both heats) was greater (P≤0.1) for oxytocin and control (100 and 81.8%, respectively) compared with PGF2α (63.6%). A reduction in conception rate for Landrace gilts treated with PGF2α (60%) was observed compared with oxytocin or control gilts (100%, P≤0.1). Farrowing rate was not affected (P>0.1) by treatments in gilts pregnant on the first or second individual heat (83.3% for control and 100% for oxytocin and PGF2α). Total farrowing rate (on both heats) was not affected (P>0.1) by the treatments (100% oxytocin and PGF2α, 88.9% for control). Treatments did not differ (P>0.1) in total piglets born and alive. No differences were observed between the two climatological seasons in none of the variables analyzed. The results of the present study provide some evidence that supplementation of oxytocin to the seminal dose could positively affect conception rate in gilts under local conditions, but more research is necessary in order to give some recommendation.