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Title: The effect of genotype and environment on growth and vascularity of the pelvic appendicular skeleton in the fowl
Author: Thorp, Barry Hunter
ISNI:       0000 0001 3533 0120
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1986
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A method is described which enables visualization of the blood supply in developing long bones. The same material was also suitable for the preparation of undecalcified histological sections. The circulatory system was perfused with a solution of dye and barium sulphate. The skeletal tissue was cleared in plastic resin before embedding and tissue blocks were cut into 1mm slabs. Laying strain and broiler fowls were reared from hatching till twenty weeks of age. Birds were killed throughout the growth period and specimens prepared for study. Gross morphological features were recorded. The origin and nature of cartilage canals were established in the bone extremities of the proximal and distal femur, proximal and distal tibiotarsus and proximal tarsometatarsus. Similar studies were performed on small groups of broiler fowls reared under different environmental conditions. Vascularity of bone extremities and morphological features were compared between the groups of fowls. Growth rate in normal and abnormal bone extremities was investigated. The involvement of vascularity in the formation and repair of dyschondroplasia was elucidated. The fundamental vascular patterns were similar in different genotypes of fowl, and similarities were apparent with vascular patterns reported in other species. Disrupted endochondral ossification in conjunction with vascular abnormalities occurred in every group of fowls. In ad libitum fed broiler fowls, lesions were most expensive, and contributed to limb asymmetry and a wide range of bone torsion. Enviromental factors greatly affected the number, range and extent of abnormalities. In some broiler fowls, the rate of lesion formation appeared to exceed that of repair. The behavioural characteristics of broilers under certain environmental conditions was detrimental to the maintainance of adequate vascular perfusion in bone extremities.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Ecology