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The length, width and thickness of cortical bone at the central diaphysis, as well as the inner structure and bone density in the tibia of growing Japanese quail (Coturnix japonica) were examined from hatching to +** days of age at +*-day intervals to investigate long bone growth in quail. The body weights were also measured. Five left tibiae in male and female quail were evaluated, respectively. The inner structure of the tibia was observed on enlarged transparent X-ray images. The bone mineral densities at the proximal epiphysis and central diaphysis were estimated by the hydroxyapatite density using the SXA method. The female weight exceeded the male weight, and a significant sexual di#erence was observed after .* days of age. There were no significant di#erences between the sexes for the length, width and thickness of cortical bone in the central diaphysis. The length, width and thickness of cortical bone stopped increasing at .*, 0* and -* days of age, respectively. In male and female quail, the growth plates in the distal and proximal epiphyses disappeared at -* and .* days of age, respectively. The medullary cavity in the female tibia became bright from .* days of age when the female quail began to lay eggs, and this was considered to represent medullary bone. The bone mineral density at the proximal epiphysis in the male tibia stopped increasing at .* days of age, whereas that in the female tibia continued to increase until +** days of age. The female bone mineral density at the diaphysis significantly exceeded the male value from +* to +** days of age. From these results, we conclude that the heavy body weight and presence of medullary bone in the medullary cavity in the female tibia raised the bone mineral densities at the proximal epiphysis and central diaphysis.
The length, width and thickness of cortical bone at the central diaphysis, as well as the inner structure and bone density in the tibia of growing Japanese quail (Coturnix japonica) were examined from hatching to +** days of age at +*-day intervals to investigate long bone growth in quail. The body weights were also measured. Five left tibiae in male and female quail were evaluated, respectively. The inner structure of the tibia was observed on enlarged transparent X-ray images. The bone mineral densities at the proximal epiphysis and central diaphysis were estimated by the hydroxyapatite density using the SXA method. The female weight exceeded the male weight, and a significant sexual di#erence was observed after .* days of age. There were no significant di#erences between the sexes for the length, width and thickness of cortical bone in the central diaphysis. The length, width and thickness of cortical bone stopped increasing at .*, 0* and -* days of age, respectively. In male and female quail, the growth plates in the distal and proximal epiphyses disappeared at -* and .* days of age, respectively. The medullary cavity in the female tibia became bright from .* days of age when the female quail began to lay eggs, and this was considered to represent medullary bone. The bone mineral density at the proximal epiphysis in the male tibia stopped increasing at .* days of age, whereas that in the female tibia continued to increase until +** days of age. The female bone mineral density at the diaphysis significantly exceeded the male value from +* to +** days of age. From these results, we conclude that the heavy body weight and presence of medullary bone in the medullary cavity in the female tibia raised the bone mineral densities at the proximal epiphysis and central diaphysis.
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