Impact of feed, light and access to manipulable material on tail biting in pigs with intact tails

Table 4 Merged treatments of individual pigs with antibiotics due to unsettlement or due to tail biting in the four buildings during the trial

Building/Group	I Light 14 h	II Led light 14 h	III Standard	IV Hay silage
Pigs slaughtered(n)	1331	1295	1418	1301
Individually treated
Tail bitten or bitten (n)	27	22	16	22
Tail bitten or bitten (%)	2.0	1.7	1,1	1.7
Pens used (n)	67	65	71	66
Pens given Time Out
Treated (n)	10	2	16	16
Treated (%)	14.9^A	3.1^B	23.9^A	24.2^A

The table also shows the incidence for spread of Time Out-pellets to pens when unsettlement/tail biting on pen level was observed
Within lines, columns with different letters differ significantly (χ²-tests; P < 0.05 II vs I; P < 0.001 II vs III and IV)

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