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Studies on magnesium in ruminant nutrition. 6. Effect of intake of water on the metabolism of magnesium, calcium, sodium, potassium and phosphorus in sheep



Studies on magnesium in ruminant nutrition. 6. Effect of intake of water on the metabolism of magnesium, calcium, sodium, potassium and phosphorus in sheep



Brit J Nutr 20(3): 609-619



In Experiment I balance studies were carried out with 6 wether sheep receiving chopped hay and concentrates and given, 0, 5, or 10 1. water/day by Intraruminal infusion. Allocation to two 3 x 3 latin squares was arranged to allow calculation of main treatment and residual effects. Infusing 10 1. water/day increased the total daily urinary output of magnesium, phosphorus and sodium by 31, 45 and 100% (P < 0.05). Fecal losses of Mg, and P tended to decrease correspondingly and with both elements retention remained positive but retention of Na became negative (P < 0.05). Residual effects were not detected, and infusining 5 1. water/day generally produced intermediate and non-significant effects. When pellets made from dried, ground, young spring pasture or concentrates rich in Mg were included in the diet of 4 wethers in Experiments 2 and 3, infusions of 10 1. water/day produced much greater decreases in fecal losses and retentions of Na and K and greater increases in the urinary excretion of those elements than those found in Experiment I. Effects on Mg, P and Ca balance were similar to those in the main experiment. The biological significance of these results and relationships between the observed effects and the etiology of hypomagnesaemic tetany are discussed.

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Accession: 014690221

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PMID: 5923630


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