Document Detail

Optimal dietary level of 1 alpha,25-dihydroxycholecalciferol for eggshell quality in laying hens.
MedLine Citation:
PMID:  2263546     Owner:  NLM     Status:  MEDLINE    
The optimal dietary level of 1 alpha,25-dihydroxycholecalciferol [1,25-(OH)2D3] for eggshell quality was established. White Leghorn hens, 59 wk of age, were fed one of eight diets that contained the same basal ingredients, including 3.1% calcium, but different levels (microgram/kg) or forms of calciferol supplements: no calciferol supplement of any form (56 hens); 27.5 (control) or 55.0 micrograms of cholecalciferol (56 hens each); 3, 5, or 7 micrograms of 1,25-(OH)2D3 (28 hens each); 5 micrograms of 24,25-dihydroxycholecalciferol [24,25-(OH)2D3] with 28 hens; 5 micrograms each of 1,25-(OH)2D3 and 24,25-(OH)2D3 (28 hens). All groups were fed the control diet prior to the 21-wk treatment. The group fed 5 micrograms 1,25-(OH)2D3/kg diet ranked first in specific gravity (SG), e.g., 1.081 versus 1.077 for the control group at Week 21 (P less than .05). The group fed 7 micrograms 1,25-(OH)2D3/kg consumed 30% less feed and laid 20% fewer eggs than the control, but shell quality was not affected. The groups receiving no calciferol supplement or receiving only 24,25-(OH)2D3 laid eggs with significantly lower SG than the control after 2 wk of treatment (1.072 or less versus 1.082 at Week 2). The rest of the treatment groups mentioned were comparable to the control in eggshell quality and egg production. Groups fed the combination of 1,25-(OH)2D3 and 24,25-(OH)2D3 per kilogram of feed, or 1,25-(OH)2D3 alone at 5 micrograms/kg, had significantly higher tibial weights relative to the control group. All groups receiving the diets without cholecalciferol supplementation had markedly reduced hatchability. It was concluded that the optimal dietary level of 1,25-(OH)2D3 for improving eggshell quality without affecting egg production was approximately 5 micrograms/kg and the toxic level was 7 micrograms/kg.
C P Tsang; A A Grunder; R Narbaitz
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Poultry science     Volume:  69     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  1990 Oct 
Date Detail:
Created Date:  1991-02-07     Completed Date:  1991-02-07     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1702-12     Citation Subset:  IM    
Animal Research Centre, Agriculture Canada, Ottawa, Ontario.
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MeSH Terms
Calcitriol / administration & dosage*
Calcium / blood
Chickens / physiology*
Egg Shell / growth & development*
Organ Size
Specific Gravity
Tibia / growth & development
Reg. No./Substance:
32222-06-3/Calcitriol; 7440-70-2/Calcium
Erratum In:
Poult Sci 1990 Dec;69(12):2253

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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