龙骨评分

Keel scoring is based on a system of 1 to 5 with a 1 meaning emaciated, and a score of 5 meaning obese. A score of 3 is considered normal; the keel bone is barely palpable, and the chest is well muscled. Using plus signs can further define birds that do not fit exactly within these five categories. Hence, 1+ is very thin, 2 is thin, 2+ is almost normal, 3 is normal, etc.