Abstract

The effects of calcium and sodium loading on organic matter digestibility and mineral absorption in sheep 3. Changes in the Ca, Mg, Zn and Cu concentrations in rumen fluid

Highlights

  • Improving the yield of the organic matter from a unit area of cultivated land necessitates the application of a wide range of fertilizers, among them mineral fertilizers

  • To be absorbed from the gastrointestinal tract, mineral elements must be in soluble form, though such absorption is usually incomplete (Ivan et al, 1979)

  • The mineral concentration in rumen fluid may be influenced by the outflow rate from the forestomachs (Teller and Godeau, 1987), pH value (Bremner, 1970; Ivan et al, 1979; Keyser et al, 1985), N H 3 - N concentration (Care et al, 1982), other mineral element intake, e.g. sodium (Moseley and Jones, 1974; Reffett and Boling, 1985), potassium (Wylie et al, 1985; Yano et al, 1988), calcium (Yano et al, 1978)

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Summary

Introduction

Improving the yield of the organic matter from a unit area of cultivated land necessitates the application of a wide range of fertilizers, among them mineral fertilizers. The one of the most popular chemical methods for improving the nutritional value of high fibre roughages is treatment with sodium hydroxide or calcium hydroxide. Both approaches, fertilization and treatment, can lead in consequence to overloading of macroelements in both ruminants and other animals. Macroelement overdosing in the ruminant diet can disorder absorption, flow rate in the gastrointestinal tract and metabolism of minerals and other dietary components (Chicco et al, 1973; Underwood, 1977; NRC, 1980; Ben-Ghedalia et al, 1982; Alfaro et al, 1988). The purpose of the present study was to estimate the effect of calcium and sodium overloading on the dynamic Ca, Mg, Zn and Cu changes in the rumen fluid

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