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Journal of Dairy Science Vol. 65 No. 3 385-389
© 1982 by American Dairy Science Association ®
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Renal Urea Handling in Goats Fed High and Low Protein Diets

Lea Eriksson and Maija Valtonen

Department of Physiology, College of Veterinary Medicine, PO Box 6, SF-00551 Helsinki 55, Finland

ABSTRACT

Four female goats first were fed a high protein diet and later a low protein diet. Renal urea handling was studied during feeding of both diets. Glomerular filtration rate was measured with [hydroxymethyl-carbon-14]inulin. Glomerular filtration rate dropped about 60% when nitrogen intake was restricted. Urea concentration of plasma fell from 6 mM on high protein diet to .6mM on low protein diet. On low protein diet the rate of urea filtration at the glomeruli was only 4% of that on high protein diet, 22 versus 519 µmol/min. In addition, tubular urea reabsorption in percentage of filtered urea rose up to 92% on low protein diet. As a result of all these renal changes following dietary nitrogen restriction, urinary urea excretion was only .6% of urinary urea excretion on high protein diet. In goats as in other ruminants, renal mechanisms effectively contribute to urea conservation during protein deprivation.




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Copyright © 1982 by the American Dairy Science Association ®.