Table 5.
The intra-cellular nuclear DNA damage rate of White Leghorns kept in conventional cages and floor-pens

Housing types	% DNA in tail	Tail moment	Olive moment
Cages	5.17±0.80^a	6.28±1.55^a	7.51±1.42^a
Floor-pens	4.26±0.56^b	5.34±1.72^b	5.42±1.17^b
P-values	<0.0001	0.0021	<0.0001