ISSN:
1432-0827
Keywords:
Ca depletion
;
Growth hormone
;
Prolactin
;
Vitamin D
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
,
Physics
Notes:
Summary Twelve hours after the diet of 3-week-old chicks was changed from a 1% to a 0.1% concentration of calcium (Ca), the growth rate and circulating levels of growth hormone had fallen while renal 25-hydroxecholecaiferol-24-hydroxylase had risen. The amount of47Ca incorporated into bone from an injection given 18 h previously was lower than in the control birds. Over the following 21/2 days on the low Ca diet, the renal 1-hydroxylase activity rose and the plasma prolactin level fell, but the other parameters moved back toward the control level. It was concluded that early adjustments in hormonal and mineral metabolism counteract the acute effects of a dietary Ca shortage until longer-term adaptive changes begin to compensate for a continuing Ca deficiency. The renal hydroxylase activities were not directly influenced by the level of circulating growth hormone or prolactin.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02405055
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