Abstract
Selenium treatment of pregnant sows and gilts was conducted as a double-blind placebo-controlled study in 5 commercial herds with a total of 350 sows and gilts (Danish Landrace, Yorkshire and Landrace-Yorkshire crossbreeds). At 3–6 weeks before farrowing the animals were injected once intramuscularly with either Na-selenite (0.05 mg Se per kg) or placebo. Blood samples were taken immediately before treatment and once again at 3–6 weeks after farrowing, to evaluate the Se status. The productivity of the sows and gilts was recorded.
Within herds there was no pretreatment difference in Se status between the two treatment groups, while a considerable variation was seen among herds. After farrowing there were only minor differences in Se status between the treatment groups, whereas the variation among herds persisted.
Overall, no effect of the Na-selenite injection was seen, in that there was no difference in number of liveborn, stillborn, and weaned piglets between the treatment groups. The number of days from weaning to oestrus and the number of oestrous cycles per pregnancy were not influenced by the Na-selenite treatment.
Keywords: ovulations, uterine involution, oestrus
Sammendrag
Selenbehandling af drœgtige søer og gylte blev udført som et dobbelt blindforsøg i 5 besætninger med ialt 350 søer og gylte af Dansk Landrace, Yorkshire og Landrace-Yorkshire krydsninger fodret med en byg-sojaskrä foderblanding tilsat 0,1 mg Se pr. kg. Behandlingen blev foretaget 3–6 uger før faringen som en enkelt intramuskulær injektion med enten Na-selenit (0,05 mg Se pr. kg) eller placebo. Blodprøver blev udtaget umiddelbart før behandlingen og igen 3–6 uger efter faringen til vurdering af selenstatus. Der blev foretaget registrering af produktionsresultaterne i besætningerne.
Før behandlingen var der ingen forskel på Se status i de to behandlingsgrupper inden for bessetningerne; men der blev konstateret en variation mellem besaetningerne. Efter faringen var der kun ubetydelige forskelle på Se status i behandlingsgrupperne; men Variationen mellem besaetningerne forblev stor.
Som helhed var der ingen effekt af Na-selenit injektionen, idet der ingen forskel var på antallet af levendefødte, d0dfødte og fravaennede grise mellem behandlingsgrupperne. Na-selenit injektionen påvirkede heller ikke antallet af dage fra fravaenningen til første løbning eller antallet af løbninger pr. drægtighed. I en enkelt besaetning var perioden fra fravaenning til løbning signifikant kortere i Na-selenitgruppen end i kontrolgruppen.
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