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Time (d) for ventilated cages to reach 25 ppm ammonia: corncob bedding (n = 9), autoclaved corncob bedding (n = 9), PCC bedding (n = 8), autoclaved PCC bedding (n = 10) bedding. *, P < 0.05 (Kruskal–Wallis and Mann–Whitney tests) compared with values for corncob and autoclaved PCC.
