Influence of dietary calcium on phosphorus absorption and excretion and on phosphorus-33 distribution in laying hens
An experiment was conducted using isotope-dilution and comparative balance techniques to estimate urinary and fecal P excretion of laying hens fed different levels of dietary Ca. Two levels of dietary Ca (3.46 and 4.2%) were fed to eight hens for 30 days. After 30 days, 50 microCi of the radioisotope /sup 33/P was injected intramuscularly to label endogenous P. On the 2nd day after /sup 33/P dosing and at 1 h postoviposition, plasma, liver, kidney, femur bone, whole egg, ileum, ileal digesta, and excreta samples were collected from each hen. Results showed a favorable effect of increasing dietary Ca consumption (2.91 vs 3.57 g/hen per day): femur ash increased (P less than .08), excreta P decreased (P less than .03), and urinary P decreased (P less than .06). The P content of ileal digesta was not affected by dietary Ca intake, but excreta P was greater for hens consuming less Ca, indicating that, during the collection period, excretion of P in urine was increased by the low Ca diet. Endogenous P secretions constituted less than 1% of the P in ileal digesta and excreta samples and this proportion was not changed by dietary Ca consumed.
- Research Organization:
- Iowa State Univ., Ames (USA)
- OSTI ID:
- 6768804
- Journal Information:
- Poult. Sci.; (United States), Journal Name: Poult. Sci.; (United States) Vol. 67:3; ISSN POSCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ABSORPTION
ALKALINE EARTH METALS
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL EFFECTS
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
BIRDS
BODY FLUIDS
CALCIUM
CHICKENS
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
ELEMENTS
FECES
FOWL
INTAKE
INTESTINAL ABSORPTION
ISOTOPE APPLICATIONS
ISOTOPE DILUTION
ISOTOPES
LIGHT NUCLEI
MATERIALS
METABOLISM
METALS
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
PHOSPHORUS
PHOSPHORUS 33
PHOSPHORUS ISOTOPES
RADIOISOTOPES
TISSUE DISTRIBUTION
TRACER TECHNIQUES
UPTAKE
URINE
VERTEBRATES
WASTES