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Effects of stocking density on expression of parathyroid hormone related protein (PTHrP) in tibial growth plate and serum alkaline phosphatase (AKP) levels of broilers. LSD, low stocking density (6.25 birds/m2); MSD, medium stocking density (12.50 birds/m2); HSD, high stocking density (18.75 birds/m2). Each bar presents means ± SD (n = 12). Different letters are different at P < 0.05.
