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Title: The effects of nutrient modification on two bone disorders of poultry
Author: Rennie, Joanna Sarah
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1995
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A large-scale experiment using Hi-sex hybrid and J-line Leghorn-type layers was carried out. After rearing under standard management and dietary procedures, birds were housed at 16 weeks in individual cages of a battery unit. The Hi-sex birds were allocated to nutritional treatments thought to be capable of influencing bone metabolism - oystershell (to contribute 50% of dietary calcium), fluoride (200 mg/kg), ascorbic acid (300 mg/kg), 1,25(OH)2D3 (5 μg/kg), low crude protein + high vitamin K (150 g/kg + 20 mg/kg), low phosphate (4.5 g/kg) plus a control treatment. Two further treatments included a group of Hi-sex birds photo-stimulated to start laying early, and the J-line birds to provide a low production rate strain comparison. Egg records were collected on a daily basis. Blood samples were taken quarterly for analysis of plasma total calcium (Ca), inorganic phosphate (Pi), and alkaline phosphatase activity (AP). Birds were killed after one year in lay, and bone samples (free thoracic vertebra; FTV, and proximal tarsometatarsus; PTM) representative of the axial and appendicular skeleton taken. Wings were also removed for X-ray. There was no effect of treatment on egg production amongst the Hi-sex birds. The J-line birds laid significantly fewer eggs. Fluoride significantly increased plasma Ca, P and AP. Oystershell increased plasma AP. The low crude protein + high vitamin K increased plasma P. Low dietary phosphate and early lighting increased plasma AP. The J-line birds had significantly lower AP activity compared with the control Hi-sex group. Image analysis of bone sections revealed that strain influenced the degree of osteoporosis more than nutrition. J-line birds had more trabecular (load-bearing) bone than any of the Hi-sex birds. Within the Hi-sex birds, oystershell and fluoride significantly increased the amount of medullary bone (labile calcium source) in the PTM only.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available