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profession in promoting animal welfare . J Am Vet Med Assoc . 2015 ; 246 ( 5 ): 502 – 504 . doi: 10.2460/javma.246.5.502 6. Casey-Trott T , Heerkens J , Petrik M , et al . Methods for assessment of keel bone damage in poultry . Poult Sci
-colony hens. But cage-free pullets had better bone quality of the humerus and tibia, though they also had more keel bone damage. Between 9 and 21 percent of flights in the aviary ended in failed landings, which could have contributed to the higher level of
