Association of Mg, Ca, P, and K with various fractions in the diet, digesta, and faeces of sheep fed fresh pasture

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Abstract
In surgically modified sheep fed perennial ryegrass, most K was associated with the water-soluble fraction of the diet, digesta, and faeces, and much Mg, Ca, and P was associated with both the water-soluble and dilute-alkali-insoluble fractions of the diet, rumen digesta, ileal digesta, and faeces. Changes in pH of the digesta markedly influenced the distribution of Mg, Ca, and P between fractions. The proportion of Mg, Ca, and P associated with the dilute-alkali-insoluble fraction increased and that with the water-soluble fraction decreased as the digesta moved along the small and large intestine. In in vitro studies, increasing the pH and the concentrations of Ca and K decreased the binding of Mg to the dilute-alkali-insoluble fraction from the diet, digesta, and faeces.

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