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(A) Housing effects on hen day egg production performance with the ED, (B) Housing effects on hen day egg production performance with CLD, and (C) Dietary effect on mean hen day egg production performance in two different housing systems. The values are means ± standard error of the mean. Significance level: ***P < 0.01 = highly significant, **p < 0.05 = significant, NS = non-significant. Abbreviations: ED, Experimental diet; CLD, commercial layer diet.
