Table 3.

Percentage of dissected keel bones with/without several damages in hens of the second generation.

Trait	Floor Housing				Single Cages
	BLA	L68	WLA	R11	BLA	L68	WLA	R11
	n = 92	n = 90	n = 74	n = 96	n = 72	n = 71	n = 70	n = 70
Percentage of keel bones with/without deformities 1
Score 4	68.09	91.11	54.05	70.83	30.56	61.97	11.43	5.71
Score 3	22.34	8.89	28.38	22.92	25.00	30.99	28.57	35.71
Score 2	9.57	0	17.57	6.25	44.44	7.04	60.00	58.57
Significance	BC	A	C	B	D	BC	E	E
Direction of keel bone deformity 2
Score 0	0	0	0	0	0	0	0	1.49
Score 1	38.71	97.50	52.94	60.71	24.00	40.74	19.67	11.94
Score 2	61.29	12.50	47.06	39.29	76.00	59.26	80.33	86.57
Significance	BC	A	AB	AB	CD	BC	D	D
Percentage of keel bones with/without fractures 3
Score 0	41.49	67.78	25.68	50.00	59.72	94.37	74.29	85.51
Score 1	58.51	32.22	74.32	50.00	40.28	5.63	25.71	14.49
Significance	B	DE	A	BC	CDE	G	EF	FG
Percentage of numbers of fractures in the caudal third of fractured keel bones
1	50.91	71.43	34.55	70.83	58.62	100	43.75	100
2	29.09	25.00	29.09	22.92	24.14	0	31.25	0
3	7.27	0	14.55	6.25	6.90	0	18.75	0
≥4	12.73	3.57	21.82	0	10.34	0	6.25	0
Significance	AB	BCD	A	CD	ABCD	ABCD	AD	BC

¹ Scoring system: 4 = no deformity, 3 = slight deformity, 2 = moderate to severe deformity. ² Scoring system: 0 = sagittal, 1 = transverse, 2 = sagittal and transverse. ³ Scoring system: 0 = fracture absent, 1 = fracture present. A–G: Overall frequencies within a row with no common letter differ significantly at p < 0.05.