Genetic improvement of hip-extended scores in 3 breeds of guide dogs using estimated breeding values: Notable progress but more improvement is needed.

For the entire dataset, quartiles were: Q25 = 0.32, Q50 = 0.37, and Q75 = 0.44, but the within breed values ( Table 2 .) are much more informative because breed differences are highly significant (F 2,9200 = 930.1, P<0.001).

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