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Flock spatial distribution during feeding time in different tiers of the multitier system. Different superscripts of lowercase indicate significant difference at the same weeks of age between different tiers (P < 0.05). *Means that there are significant differences at the same tier between different weeks of age (P < 0.05). nsMeans that there are no significant differences at the same tier between different weeks of age (P > 0.05).
