Table 1. Performed and received abnormal behaviours (mean±S.D.) in neutral pigs (N) housed in tail biting pens (n = 60) compared to control pigs (C) housed in control pens (n = 99).

		Performed				Received
	D.F	N	C	P	T	N	C	P	T
Tail in mouth	146	0.13±0.50	0.31±0.60	0.01	2.52	0.30±0.59	0.38±0.82	n.s.	0.24
Belly nosing	146	0.30±0.62	0.95±1.59	<0.01	2.64	0.42±1.46	1.06±2.60	0.06	1.89
Ear biting	146	0.30±0.89	0.46±1.38	n.s.	1.14	0.52±1.05	0.54±1.22	n.s.	−0.25
Mounting	146	0.30±1.01	0.19±0.70	n.s.	−1.19	0.63±1.40	0.18±0.48	<0.01	−2.75
Bar biting	146	0.52±1.43	0.11±0.35	0.04	−2.11
Other abnormal	146	0.42±1.06	1.53±4.26	<0.01	3.42	0.97±1.00	1.34±1.92	0.02	2.42