There was no significant difference in serum alkaline phosphatase between the SY1, SY2 group and the control in the determination of the serum biochemical indicators of the lactating piglets at different concentrations of probiotics (P>0.05); the difference between the SY2, SY3, and SY4 groups was not significant. Significant (P>0.05). The difference between SY2 and DZ group was extremely significant (P0.05).
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