Utilization of phosphorus in poultry as influenced by dietary calcium and phosphorus source
Experiment one was a 3 x 3 x 2 factorial arrangement of three levels of calcium (Ca) (3.0, 3.5, and 4.0%) fed with three phosphorus (p) feeding programs to two strains of laying hens for 336 days. In addition to production traits, measurements of P retention were made at 34, 42, 50, 62, and 72 weeks of age and phytate P retention and % P associated with excreted phytate at 34, 50, and 72 weeks of age. The phase feeding P programs adequately supported production characteristics. Experiment two involved feeding two levels of Ca (.8 and 1.2%) to one-week-old chicks for 7 days during which time /sup 33/P was administered to each chick. Serum P and excreta /sup 33/P activity were greater in chicks fed .8% Ca, while femur /sup 33/P was greater in checks fed 1.2% Ca. The % P associated with excreted phytate ranged from 5.6 to 7.0% and phytate P utilization ranged from 31 to 48%. P retention and bone P deposition were greater in chicks fed 1.2% Ca. The final experiments were conducted utilizing isotope-dilution (/sup 33/P) and comparative-balance methods to estimate urinary and fecal P excretions by laying hens fed 3.46 or 4.2% Ca.
- Research Organization:
- Iowa State Univ. of Science and Technology, Ames (USA)
- OSTI ID:
- 5347655
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ALKALINE EARTH METALS
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOCHEMICAL REACTION KINETICS
BIRDS
CALCIUM
CHICKENS
CLEARANCE
DAYS LIVING RADIOISOTOPES
DIET
ELEMENTS
EXCRETION
FOWL
ISOTOPE APPLICATIONS
ISOTOPE DILUTION
ISOTOPES
KINETICS
LIGHT NUCLEI
METABOLISM
METALS
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
PHOSPHORUS
PHOSPHORUS 33
PHOSPHORUS ISOTOPES
RADIOISOTOPES
REACTION KINETICS
RETENTION
TRACER TECHNIQUES
VERTEBRATES