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. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: J Anim Sci. 2012 Sep 5;90(13):5182–5192. doi: 10.2527/jas.2012-5417

Figure 4.

Figure 4

Air quality within pens as a function of housing density and frequency of cage changing. (A) Temperature; (B) humidity; (C) ammonia; (D) carbon dioxide. For females (F) and males (M), each bar is the mean and SEM of 3 pens/group. Each pen was measured at 8 different times, so each bar represents the mean of 24 measurements. Open bars are 5 mice/pen (D5); closed bars are 9 mice/pen (D9). Bedding was changed weekly or every 2 weeks as shown, and air was measured on the day prior to change (day 6 or 13).