Studies on effects of nutritional factors on bone structure and osteoporosis in laying hens

1. A modern hybrid strain of laying hen (Hisex) was fed from point of lay to 68 weeks on a control diet and diets containing oystershell, fluoride, 1,25-dihydroxycholecalciferol, ascorbic acid, a lower concentration of phosphorus and a combination of a lower concentration of crude protein and higher...

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Bibliographic Details
Published in:British poultry science 1997-09, Vol.38 (4), p.417-424
Main Authors: Rennie, J. S., Fleming, R.H., McCormack, H. A., McCorquodale, C. C., Whitehead, C. C.
Format: Article
Language:English
Subjects:
Animal Nutritional Physiological Phenomena
Animals
Ascorbic Acid
Bone Density
Calcitriol
Chickens - physiology
Dietary Proteins
Dietary Supplements
Female
Fluorides
Osteoporosis - epidemiology
Osteoporosis - veterinary
Ostreidae
Oviposition
Phosphorus
Poultry Diseases
Species Specificity
Vitamin K
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Summary:1. A modern hybrid strain of laying hen (Hisex) was fed from point of lay to 68 weeks on a control diet and diets containing oystershell, fluoride, 1,25-dihydroxycholecalciferol, ascorbic acid, a lower concentration of phosphorus and a combination of a lower concentration of crude protein and higher concentration of vitamin K. Hens from a much older strain (Brown Leghorn J-line) were fed on the control diet. 2. Plasma variables were measured during lay. End-of-lay trabecular and medullary bone volumes in the proximal tarsometatarsus and free thoracic vertebra were measured by histomorphometry. 3. The majority of Hisex hens were considered to be osteoporotic by the end of lay. In contrast, none of the J-line were osteoporotic. 4. None of the nutritional treatments affected trabecular bone volumes. Medullary bone volumes were increased significantly by feeding oystershell or fluoride. 5. There was no phenotypic correlation between egg production and trabecular bone volume in the Hisex hens. 6. The experiment provided evidence that osteoporosis in laying hens, as assessed by trabecular bone volumes, is not caused by calcium deficiency and could not be prevented by any of the nutritional treatments studied.
ISSN:0007-1668
1466-1799
DOI:10.1080/00071669708418012