| Summary: | 碩士 === 國立屏東科技大學 === 獸醫學系所 === 95 === Recently, leg-weakness syndrome is a common disease of broiler chicken. The culling rates of the chicken is increasing and inducing heavy economic loss. In the present study, the methods of pathology, X-ray, and microbiology were used to examine the bone lesions of the affected chicken. A total of 112 cases were collected from 36 poultry farms, locating in eastern Taiwan. Among them, 60 cases showed vertebral lesions, including spondylolisthesis （34 cases; 56.6%）, osteochondrosis（26 cases; 43.3%）, spondylitis（8 cases; 13.3%）, and roachback syndrome（2 cases; 3.3%）. In 52 cases of tibial lesions, included tibial dyschodroplasia（36 cases ; 69.2%）, rickets（34 cases; 65.3%）, twisted leg（29 cases; 55.7%）, osteomyelitis（13 cases; 25.0%）, and chondrodystrophy（2 cases; 3.8%）. Based on our studies, a variety of bone lesions could be detected in broiler chicken. The causes need to be further studied.
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