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THE EFFECTS OF FEEDING EITHER ROUGHAGE OR CONCENTRATE DIETS ON SALIVARY PHOSPHORUS SECRETION, NET INTESTINAL PHOSPHORUS ABSORPTION AND URINARY PHOSPHORUS EXCRETION IN THE SHEEP
Author(s) -
Scott D.,
Buchan W.
Publication year - 1985
Publication title -
quarterly journal of experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0144-8757
DOI - 10.1113/expphysiol.1985.sp002922
Subject(s) - phosphorus , excretion , endocrinology , medicine , absorption (acoustics) , urine , hay , zoology , chemistry , biology , physics , organic chemistry , acoustics
Mature sheep fitted with rumen and duodenal cannulae were fed either a hay or a concentrate diet and the effects on salivary phosphorus secretion, net intestinal phosphorous absorption and pathway for phosphorous excretion were examined. Route of excretion was markedly affected by diet with urine phosphorus levels being much higher and faecal levels lower when the concentrate diet was fed. This difference was not due to differences in phosphorus intake nor could it be related to differences in either plasma phosphorus levels or net intestinal phosphorus absorption. Salivary phosphorus secretion and renal tubular reabsorptive efficiency for phosphorus were, however, both lower when the concentrate diet was fed. The significance of these effects of diet in relation to the control of phosphorus balance in ruminants is discussed.