Abstract
A peach-faced lovebird with abnormal red feathers was used as a validated case for diagnostic therapy, and an improvement in the feather color was dependent on Thyradin administration. In addition, Thyradin was administered to 19 lovebirds with abnormal red feathers, and the feather color improved in all cases. To resolve the pathogenesis of this condition, epidemiological information and blood test data were collected for all the birds. This pathological condition is common in older female birds with obesity and strong estrus. High values of alkaline phosphatase, total cholesterol, and triglycerides were obtained in all cases; however, these abnormal values may be due to estrus. The present study findings suggest that hypothyroidism is closely related to the appearance of abnormal red feathers.
