Figure 5
From: Aggression and cortisol levels in three different group housing routines for lactating sows
Median number of attacks initiated and attacks received by primiparous sows ( n  = 11) and multiparous sows ( n  = 32), recorded during 2 h for four consecutive days. The range of number of attacks initiated/received within groups is reported above each bar. There were significant differences between multiparous and primiparous sows for both parameters (P < 0.001).