Figure 3.

The mean (±SEM) pen level hourly rates of (a) enrichment interaction and (b) drinking before and after injections (time of day of injections: 0 h) during the saline control days (Con) and the days of total vaccination of all pigs within the pens (total Vacc). Effect of treatment – enrichment: P < 0.001, drinking: P < 0.001; time of day – enrichment: P < 0.001, drinking: P < 0.001; and treatment × time of day – enrichment: P < 0.001; drinking: P = 0.052. Differences of P < 0.05 in the least square mean rates of that specific behavior between the Con and total Vacc treatments at the same time points are marked with different superscripts.