a decreasing trendP < 0.10
With regard to the indices associated with energy metabolism, there were reductions ( P < 0.05) in Na + /K + -ATPase activity and ATP level, concomitant with a decreasing trend ( P < 0.10) of the activities of ALP and Ca 2+ /Mg 2+ -ATPase in the layer intestine of LP group relative to PP group (Table 2 ).