Influence of dietary source of phosphorus on fecal and urinary excretion of phosphorus and other minerals by male cats.
Twelve male cats were fed 2 diets that differed in the source of P. In diet 1 (1.4% P), 62.7% of P originated from poultry, meat, and fish meal, and the remainder from other organic ingredients of food. In diet 2 (1.6% P), 63.5% of P was derived from neutral monobasic/dibasic salts, and the remainder from other organic ingredients of the food. The P intake was nearly the same with both diets, but there was a significant (P less than 0.05) difference between diets in the percentage of ingested P that was excreted in the urine (14.7 +/- 5.3% for diet 1; 34.9 +/- 8.4% for diet 2), and in 6-day urinary P excretion (774 +/- 290 mg for diet 1; 2,004 +/- 556 mg for diet 2). The P concentrations in urine samples obtained by cystocentesis after cats ate were significantly (P less than 0.05) higher when cats were fed diet 2 than when those same cats were fed diet 1. Plasma P concentrations increased after ingestion of diet 2, but were unchanged after ingestion of diet 1. Seemingly, urinary excretion of P was markedly influenced by dietary composition. Diets with the same P content have potential for different biologic effects because of differences in availability of P.
Finco
D R
DR
Department of Physiology, College of Veterinary Medicine, University of Georgia, Athens 30602.
Barsanti
J A
JA
Brown
S A
SA
D000818:Animals; D002415:Cats; D004032:Diet; D005243:Feces / Q000032:analysis*; D005396:Fish Products / Q000032:analysis; D008297:Male; D008460:Meat / Q000032:analysis; D010758:Phosphorus / Q000008:administration & dosage / Q000378:metabolism* / Q000652:urine; D011202:Poultry Products / Q000032:analysis; D012964:Sodium / Q000378:metabolism / Q000652:urine; D013997:Time Factors
D010758:Phosphorus; D012964:Sodium