Relationships between genetic, environmental and nutritional factors influencing osteoporosis in laying hens

Published on Dec 1, 2006in British Poultry Science1.42
· DOI :10.1080/00071660601077949
Robert Fleming18
Estimated H-index: 18
(The Roslin Institute),
Heather McCormack15
Estimated H-index: 15
(The Roslin Institute)
+ 1 AuthorsC C Whitehead24
Estimated H-index: 24
(The Roslin Institute)
1. The effects upon bone quality of feeding limestone in flour or particulate form and housing type (cage or aviary) in lines of hens divergently selected for high (H) or low (L) bone strength over 7 generations were investigated. 2. As in previous generations, highly significant phenotypic differences between lines were observed in all measured bone traits at peak egg production (25 weeks) and towards the end of production (56 weeks) in both cage and aviary systems. 3. At 25 weeks there were no significant effects on bone variables of feeding particulate limestone although a significant reduction in osteoclast number was observed at this age. By 56 weeks osteoclast numbers were further reduced in hens fed particulate limestone and beneficial effects on some bone variables were observed in this treatment group. 4. The genotypic and dietary improvements upon bone quality were independent and additive at both ages. There were very few interactive effects. 5. Hens with the freedom to move in an aviary enviro...
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