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INTERACCIÓN SELENIO-REPRODUCCIÓN EN OVINO EXTENSIVO DE DEHESA569pellets containing sodium selenate or Astragalusbisulcatus as a selenium source. Veterinary andhuman Toxicology, 37, 30-32.ROTRUCK, J. T.; POPE, A. L.; GANTHER, H. E.;SWANSON, A. B.; HAFEMAN, D. G. yHOEKSTRA, W. C., 1973. Selenium: biochemicalrole as a component of glutathione peroxidase.Science, 179, 588-590.SMITH, K. L.; HOGAN, J. S.; WEISS, W. P., 1997.Dietary vitamin E and selenium affect mastitisand milk quality. Journal of Animal Science, 75,1659-1665.SPEARS, J. W.; HARVEY, R. W.; SEGERSON, E.C., 1986. Effects of marginal selenium deficiencyand winter protein supplementation on growth,reproduction and selenium status of beef cattle.Journal of Animal Science, 63, 586-594.VAN KAMPEN, E. J.; ZILJSTRA, W. G., 1961.Standardization of hemoglobinometry II. Thehemoglobincyanide method. Clinica ChimicaActa, 6, 538-542.VAN RYSSEN, J. B. J.; BRADFIELD, G. D.; VANMALSEN, S.; DE VILLIERS, J. F., 1992. Responseto selenium supplementation of sheep grazingcultivated pastures in the Natal Midlands.Tydskrift Sud-Afrikaanse Veterinär Vereinigung,63, 148-155.7006005004003002001000E+01ªGSHP(UI/g Hb)2ªEXTRACCIONES3ª4ª7006005004003002001000GrupoGrupoGrupoGrupo4035302520151050403427Ovejas paridas403135302520151050Grupo 1Grupo 2Grupo 3Grupo 4Figura 1: Evolución temporal de la actividad media de laglutation peroxidasa (GSHPx) (UI/g Hb) en los grupos 1,2, 3 y 4.Figura 2: Número de ovejas paridas en los grupos 1, 2,3 y 4.

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