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. 2019 Mar 29;9:5344. doi: 10.1038/s41598-019-41798-7

Figure 1.

Figure 1

Experimental apparatus. During Treatment sessions, calves were locked in their assigned treatment pen for 6 hours. During pre-treatment exposure and test sessions, removable gates were taken out to allow calves to freely roam between pens until they chose to lie down.