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Release of nitrogen sulfur phosphorus calcium magnesium potassium and sodium from 4 tropical hays during their digestion in nylon bags in the rumen



Release of nitrogen sulfur phosphorus calcium magnesium potassium and sodium from 4 tropical hays during their digestion in nylon bags in the rumen



Journal of the Science of Food and Agriculture 29(6): 520-526



The rate of release of N, S, P, Ca, Mg, K and Na from 4 milled tropical hays in nylon bags in the rumen of cattle over a 168 h period were measured. The hays were: Medicago sativa, Stylosanthes humilis, Chloris barbata and Heteropogon contortus. Three ways were used to express results: element as percentage of element initially present; element as percentage of dry matter initially present and element as its concentration in residual dry matter. The proportions of elements removed during digestion were positively related to initial concentration of the elements in the hays, with the exception of P in C. barbata hay. High proportions of Mg and K were released within 48 h in all hays. Only about 60% of N, P and Ca initially present was removed even after 168 h in the rumen. Amounts of elements remaining became constant for each element after 48 h. Concentrations of elements in the residual dry matter after decreasing in the first 24 h, increased in the latter stages of digestion, even though cell wall digestion continued. The 4 hays released the 7 elements differently. The elements in Medicago were most soluble and those in Heteropogon the least soluble. The extent of solubilization in Stylosanthes and in Chloris varied with the element concerned. In Heteropogon hay, which had low element concentrations initially, less than half of the N, S, P, Ca and Na were released even after 168 h digestion.

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Accession: 006306160

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