THE EFFECTS OF FEEDING EITHER ROUGHAGE OR CONCENTRATE DIETS ON SALIVARY PHOSPHORUS SECRETION, NET INTESTINAL PHOSPHORUS ABSORPTION AND URINARY PHOSPHORUS EXCRETION IN THE SHEEP

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Abstract
Mature sheep fitted with rumen and duodenal cannulae were fed either a hay or a concentrate diet and the effects on salivary P secretion, net intestinal P absorption and pathway for P excretion were examined. Route of excretion was markedly affected by diet with urine P levels being much higher and fecal levels lower when the concentrate diet was fed. This difference was not due to differences in P intake nor could it be related to differences in either plasma P levels or net intestinal P absorption. Salivary P secretion and renal tubular reabsorptive efficiency for P, however, both lower when the concentrate diet was fed. The significance of these effects of diet in relation to the control of P balance in ruminants is discussed.