Transport of feed selenium to different tissues of bulls

Abstract

The effects of different types of Se supplementation on the selenium concentration of beef, bovine internal organs and some other tissues were studied. The animals (thirty-two bulls) were kept in four dietary groups from birth until to the age of 13-14 months, and fed on rations containing either 0.03 mg Se/kg (basic level in local feeds), 0.25 mg inorganic Se supplemented as sodium selenite, or 0.25 or 0.4 mg/kg plant Se in dry matter from feed produced by spraying with sodium selenite. Samples of four muscles and ten other tissues and organs were taken at slaughter. Se was determined by an electrothermal atomic absorption method. Se supplementation significantly increased the Se concentration of all tissue samples. The maximum response was caused by the diet containing 0.40 mg/kg plant Se. In muscles, this diet raised the Se concentration by a factor of 10-12. In other samples, the increment was 15-75 fold, depending on the type of tissue. In general, plant Se raised the Se level more effectively than inorganic Se. Se supplementation did not affect the vitamin E status of muscle tissue.

Fontes orgânicas e inorgânicas de selênio na nutrição de vacas leiteiras: digestão, absorção, metabolismo e exigências

“…Metabolismo, exigências e excreção de selênio Após a absorção intestinal, SeMet e SeCis podem ser metabolizadas pelos animais como aminoácidos (EKHOLM et al, 1991). Isso ocorre especialmente com a SeMet, que, de forma similar à metionina, pode ser incorporada a proteínas pelo mesmo códon AUG, pois o tRNA não diferencia a metionina da SeMet.…”

The serum selenium concentrations in children and young adults: a long-term study during the Finnish selenium fertilization programme

“…Fertilizers used for the production of hay and fodder were supplemented with 6 mgakg of Se in the form of sodium selenate, and fertilizers for cereal were supplemented with 16 mgakg. As a result, Se content increased in agricultural products, in dairy products and in meat (Varo et al, 1988;1994;Eurola et al, 1989Eurola et al, , 1991Ekholm et al, 1991). An increase followed in the Se intake and resulted in higher serum Se concentration in the whole population.…”

Meat composition and quality of young growing Belgian Blue bulls offered a fattening diet with selenium enriched cereals

“…The Se content in both muscles increased 2.75 times when compared with the control. Several authors observed significant effects of supplementation with organic Se on the Se level in cattle muscles (Ekholm et al 1991;Lawler et al 2004;Juniper et al 2008;Pereira et al 2012). The significance of the enrichment is different depending on the Se type, source and administered dose.…”