Table 1.

Number of hens examined (n) and percentage of hens with keel bone deformities (Score 2 and 3) assessed intra vitam in the first generation.

Week of Age	Floor Housing								Single Cages
	BLA		L68		R11		WLA		BLA		L68		R11		WLA
	n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%
15	169	0.49 AB	166	0 B	168	0 B	167	2.99 A	-	-	-	-	-	-	-	-
21	97	5.15 D	93	4.30 DE	96	1.04 E	94	1.06 DE	71	12.68 C	71	2.82 DE	72	76.39 A	72	45.83 B
29	97	7.22 D	89	6.74 D	95	16.84 C	92	8.70 CD	68	61.76 B	69	11.59 CD	72	90.28 A	72	81.94 A
37	97	11.34 DE	89	5.62 E	95	24.21 C	90	21.11 CD	67	71.64 B	69	11.59 DE	72	95.83 A	71	90.14 A
45	95	17.89 DE	89	12.36 E	95	29.47 CD	89	42.70 C	67	77.61 B	67	22.39 DE	72	94.44 A	70	91.43 A
57	72	22.22 DE	81	11.11 E	95	46.32 C	80	45.00 C	67	80.60 B	66	25.76 D	72	95.83 A	68	89.71 A
61	72	20.83 EF	90	11.25 E	95	42.10 CD	77	44.16 C	66	78.79 B	65	29.23 C	72	95.83 A	68	89.71 A
69	71	26.76 DE	79	13.92 F	95	40.00 CD	73	43.84 C	64	84.37 B	65	23.08 EF	70	97.14 A	67	94.03 A

^A–F Frequencies within a row with no common superscript differ significantly at p < 0.05.