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Monitoring Hip and Elbow Dysplasia Achieved Modest Genetic Improvement of 74 Dog Breeds over 40 Years in USA

Figure 2

Distribution of hip and elbow scores released between 1974 and 2009.

Figure 2A: Only three categories of hip scores (Excellent, Good and Fair) were jointly released as Normal between 1974 and 1985 and separately reported after 1985. There was no release on other categories before 2000. Then, all categories were released and reported separately; Figure 2B: Elbow I meant “Normal”, Elbow II, III, IV meant osteoarthritis (degenerative joint disease) level I, II and III respectively. Few elbow scores were released except for category “Normal” before 2000. The reports were heavily biased against reporting poor hip and elbow scores in the first 30 years.

Figure 2

doi: https://doi.org/10.1371/journal.pone.0076390.g002