Summary
An experiment was conducted to determine the mineral status of purebred Brahman beef cattle grazing Bermuda-Bahia pastures grown on sandy, well-drained soils in Central Florida. Soil, plant, blood serum and liver tissue concentrations of calcium, potassium, sodium, magnesium, manganese and cobalt were generally adequate. Sixty-nine per cent of forages and 40% of serum samples were deficient in phosphorus. Seventy-five per cent of soils, 38% of forages and 18% of liver samples were deficient in copper. Sixty-nine per cent of forage samples were low, less than 30 ppm, in iron. All samples of forage, liver and serum were deficient in selenium. Likewise, all soil and forage samples and 47 and 88% of serum and liver samples, respectively, were deficient in zinc. Mineral elements most likely deficient and needed in supplements for grazing cattle on sandy, well-drained soils in the warm climate region of Central Florida are phosphorus, copper, selenium and zinc.
Résumé
Une expérience a été réalisée pour déterminer les taux minéraux de bovins Brahman paturant des prairies d'herbe des Bermudes/herbe de Bahia sur des sols sableux bien drainés du centre de la Floride. Les concentrations en calcium, potassium, sodium, magnésium, manganèse, et cobalt du sol, des plantes, du sérum sanguin et du tissu hépatique étaient généralement adéquates. Soixante neuf pour cent des fourrages et 40% des echantillons de sérum étaient déficients en phosphore. Soixante quinze pour cent des sols, 38% des fourrages, et 18% des échantillons de foie étaient déficients en cuivre. Soixante neuf pour cent des échantillons de fourrages étaient pauvres, moins de 30 ppm en fer. Tous les échantillons de fourrage, de foie et de sérum étaient déficients en selenium. De même tous les échantillons de sol, de fourrage et 47 et 88% des échantillons de sérum et de foie respectivement étaient déficients en zinc. Les éléments minéraux qui ont le plus de chances de faire défaut et dont on a le plus besoin dans les compléments pour animaux au pâturage sur les sols sableux, bien draines dans la zone à climat chaud du centre de la Floride sont le phosphore, le cuivre, le selenium et le zinc.
Resumen
Se llevó a cabo un experimento tendiente a determinar el estado metabólico mineral de ganado Brahman puro, pastoreando pasto Bermuda-Bahia en suelos arenosos bien drenados, en le parte Central de Florida. Se tomaron muestras de suelo, plantas y suero sanguíneo y concentraciones en el tejido hepático de calcio, potasio, sodio, magnesio, manganeso y cobalto. El 69% de las muestras de forraje y el 40% de las muestras de suero fueron deficientes en fósforo. El setenta y cinco por ciento de suelos, el 38% de forrajes y el 18% de las muestras de tejido hepático fueron deficientes en cobre. Sesenta y nueve por ciento de las muestras de forraje tuvieron menos de treinta ppm, de hierro. Todas las muestras de forraje, tejido hepático y suero fueron deficientes en selenio. Lo mismo, todas las muestras de suelos y forraje, asi como 47 y 88% de sueros y muestras de tejido hépatico, respectivamente, fueron deficientes en zinc. Se concluye, que los elementos posiblemente más necesitados en suplementos minerales para ganado en la zona son: fósforo, cobre, selenio y zinc.
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Florida Agr. Exp. Sta. Journal Series No 4308.
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Salih, Y.M., McDowell, L.R., Hentges, J.F. et al. Mineral status of grazing beef cattle in the warm climate region of Florida. Trop Anim Health Prod 15, 245–251 (1983). https://doi.org/10.1007/BF02242070
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DOI: https://doi.org/10.1007/BF02242070