Influence of dietary calcium on bone calcium utilization
In Experiment 1, 10 microCi /sup 45/Ca/day were administered to 125 hens for 10 days. Hens were then allocated to five treatments with calcium levels ranging from .08 to 3.75% of the diet. In Experiment 2, hens with morning oviposition times were randomly allocated to 11 treatments that were periods of time postoviposition ranging from 6 hr to 24 hr, in 2-hr increments (Experiment 2). At the end of each 2-hr period, eggs from 25 hens were removed from the uterus. The 18-, 20-, and 22-hr treatments were replicated three times. In Experiment 3, hens were fed either ad libitum or feed was withheld the last 5 or 6 hr before oviposition. In Experiment 4, hens were fed 10 microCi of /sup 45/Ca for 15 days to label skeletal calcium. Hens were divided into two groups and fed a .08 or 3.75% calcium diet for 2 days. On the second day, 25 hens fed the 3.75% calcium diet were intubated with 7 g of the same diet containing .5 g calcium at 1700, 2100, 0100, 0500, and 0700 hr. The measurements used were egg weight, shell weight, and /sup 45/Ca content of the egg shell. Results indicated a significant linear or quadratic regression of dietary calcium levels on /sup 45/Ca accumulation in eggshells and eggshell weight (Experiment 1). As the calcium level of the diet increased, eggshell weight increased and /sup 45/Ca recovery decreased. Utilization of skeletal calcium for shell formation ranged from 28 to 96%. In Experiment 2, the rate of shell calcification was not constant throughout the calcification process but varied significantly.
- Research Organization:
- Auburn Univ., AL
- OSTI ID:
- 5578587
- Journal Information:
- Poult. Sci.; (United States), Vol. 2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALCIUM
BIOLOGICAL ACCUMULATION
METABOLISM
CALCIUM 45
CHICKENS
DIET
DOSE-RESPONSE RELATIONSHIPS
EGGS
SKELETON
WEIGHT
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METALS
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIRDS
BODY
CALCIUM ISOTOPES
DAYS LIVING RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
FOWL
INTERMEDIATE MASS NUCLEI
ISOTOPES
METALS
NUCLEI
ORGANS
RADIOISOTOPES
VERTEBRATES
550501* - Metabolism- Tracer Techniques