Table 1. Environmental provisions to each flock.

Farm	Under-floor heating	Lighting regimen (18 h continuous vs 16 h intermittent)	Flock	Space allowance (m2/chick started)	Environmental enrichment type (X indicates provision)
					Boxes	Peat	Wood shavings bales
1	Yes	18 h	1	0.070	X	X	X
			2	0.061		X
2	Yes	18 h	1	0.066	X	X	X
			2	0.073	X	X	X
3	No	16 h	1	0.057
			2	0.073	X	X	X
4	Yes	18 h	1	0.056
			2	0.072	X	X	X
5	Yes	16 h	1	0.057
			2	0.072	X	X	X
6	No	18 h	1	0.057	X	X	X
			2	0.072	X	X	X
7	Yes	16 h	1	0.068	X	X	X
			2	0.058
8	Yes	18 h	1	0.061	X	X	X
			2	0.074	X	X	X
9	Yes	18 h	1	0.063	X
			2	0.071	X	X
10	No	16 h	1	0.072	X	X	X
			2	0.060	X	X
11	No	16 h	1	0.062
			2	0.071	X	X	X
12	No	18 h	1	0.069	X	X	X
			2	0.063		X
13	Yes	16 h	11	0.058	X		X
			2	0.060	X
14	Yes	18 h	1	0.060	X		X
			2	0.066	X
15	Yes	18 h	1	0.061	X	X
			2	0.063

¹On-farm welfare assessment data missing from this flock.