Document Detail

Influence of hormonal extracts on hens producing eggs with non-calcified or partially calcified shells and factors associated with this condition.
MedLine Citation:
PMID:  1156926     Owner:  NLM     Status:  MEDLINE    
1. Daily injection of hypothalameal extract (HE) and adenohypophyseal extract (AE) into hens aged 56 or 67 weeks for 14 d did not significantly influence the production of shell-less (SL) or ultra-thin-shell (UTS) eggs. 2. The injection of HE significantly increased hard-shell (HS) egg production in the younger hens. 3. Neither AE nor HE affected egg weight, serum calcium, gain in body weight or food consumption. 4. In a third experiment hens selected for poor egg production laid at a rate of 58% of which 36% were SL, 29% UTS and 35% HS eggs. Whereas the production rate of the good layers was 65% of which 1-4% were SL and 1-4% were UTS eggs. 5. Specific gravity of HS eggs, serum calcium, weight of ovary, oviduct, or adenohypophysis did not differ between good and poor layers. 6. Since SL and UTS eggs are easily overlooked the decrease in egg production with age may be as great as indicated by normal production records; the problem may be concerned more with the mechanism of shell formation.
D A Roland; D R Sloan; R H Harms
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  British poultry science     Volume:  16     ISSN:  0007-1668     ISO Abbreviation:  Br. Poult. Sci.     Publication Date:  1975 Sep 
Date Detail:
Created Date:  1975-11-26     Completed Date:  1975-11-26     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  15740290R     Medline TA:  Br Poult Sci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  423-9     Citation Subset:  IM    
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MeSH Terms
Calcification, Physiologic
Calcium / blood
Chickens / physiology*
Egg Shell*
Oviducts / physiology
Pituitary Gland*
Pituitary Gland, Anterior*
Tissue Extracts / pharmacology*
Reg. No./Substance:
0/Tissue Extracts; 7440-70-2/Calcium

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

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