III. Quantitative aspects of phosphorus excretion in ruminants.
Ruminant phosphorus excretion and metabolism were studied through a database. Faecal endogenous phosphorus is the main pathway of phosphorus excretion and averages 0.85 of total faecal phosphorus. The remaining 0.15 is unabsorbed dietary phosphorus. Faecal endogenous phosphorus is mainly unabsorbed phosphorus, with saliva being the major source, and is correlated to factors influencing saliva secretion (DM intake, physical dietary characteristics and dietary phosphorus content). Another source of faecal endogenous phosphorus is rumen microbial phosphorus that escaped solubilisation during post-rumen digestion. All factors stimulating microbial growth would increase phosphorus uptake by the rumen microbes and consequently the faecal endogenous phosphorus. Understanding the determinants of faecal endogenous phosphorus flow will help to precise the determination of net phosphorus requirements for maintenance. The role of plasma phosphorus in urinary phosphorus loss is discussed.
Bravo
David
D
UMR INRA-INAPG, Physiologie de la Nutrition et Alimentation, 16 rue Claude Bernard, 75231 Paris Cedex 05, France. dbravo@inzo-net.com
Sauvant
Daniel
D
Bogaert
Catherine
C
Meschy
François
F
D000818:Animals; D002417:Cattle / Q000378:metabolism; D016206:Databases, Bibliographic / Q000592:standards; D004063:Digestion; D005243:Feces / Q000737:chemistry*; D006041:Goats / Q000378:metabolism; D007408:Intestinal Absorption; D007668:Kidney / Q000378:metabolism; D009751:Nutritional Requirements; D010758:Phosphorus / Q000097:blood / Q000378:metabolism* / Q000652:urine; D015203:Reproducibility of Results; D012417:Rumen / Q000378:metabolism / Q000382:microbiology; D012418:Ruminants / Q000378:metabolism*; D012463:Saliva / Q000737:chemistry*; D012756:Sheep / Q000378:metabolism
D010758:Phosphorus