02712naa a2200385 a 450000100080000000500110000800800410001902400430006010000210010324501210012426000090024552016410025465000140189565000090190965000210191865000100193965000140194965000230196365000230198665000150200965000100202465000220203465000100205665000100206665000100207665000140208665000110210065000110211165300350212265300160215765300210217365300300219470000170222477300850224115207272023-06-13       1972    bl uuuu     u00u1 u    #d7 a10.1113/expphysiol.1972.sp002158.2DOI1 aWARNER, S. C. I.  aIntraruminal and systemic responses to variations in intake of sodium and potassium by sheep.h[electronic resource]  c1972  aAbstract: A maintenance diet providing about 200 m-equiv potassium and 30 m-equiv sodium per day was given to sheep; on this intake sodium and potassium balances were small and positive. When potassium chloride was added to the diet to provide a total of about 700 m-equiv potassium per day, the potassium content of the rumen increased and the sodium content decreased, apparently due to an increased rate of absorption of sodium across the rumen wall. The rate of excretion of sodium in the urine was increased for about 4 days, giving a considerable negative sodium balance; the extra amount excreted was of the same order of magnitude as the loss from the rumen. Water consumption increased by 0·5-0·9 l./day, without change in water balance. The apparent potassium balance increased by an amount much greater than could be accounted for by changes in rumen content. When the potassium content of the diet was returned to its initial value there was an intense retention of sodium by the kidney, with signs of increased adrenocortical activity and a strongly positive sodium balance for about 14 days. During this time the sodium content of the rumen increased and the potassium content decreased slowly to about initial values. Water consumption retumed to normal and the potassium balance dropped, often to low or even negative values for a while. The mechanisms apparently permitting the rumen to dominate the response of the whole animal to changes in the electrolyte content of the diet are discussed. The authors thank Messrs N. R. Bradbury, A. A. Fawcett, E. M. Rust and B. W. Wilson for their skilful technical assistance.  aChlorides  aDiet  aDietary minerals  aFeces  aPotassium  aPotassium chloride  aRuminant nutrition  aSalivation  aSheep  aCloreto de Sódio  aDieta  aFezes  aOvino  aPotássio  aRúmen  aSaliva  aEquilíbrio Hidroeletrolítico  aNatriuresis  aNutricao Mineral  aWater-electrolyte balance1 aSTACY, B. D.  tQuarterly Journal of Experimental Physiologygv. 57, n. 2, p. 89-102, Apr. 1972.