A study was conducted to determine if Se source fed during gestation and lactation affects passive transfer of immunoglobulins.Sixty days prior to breeding(d-60),gilts were randomly assigned to one of three treatments prior to breeding and throughout gestation:control(Control,no supplemental Se;n = 8),inorganic Se(Inorganic Se,0.3 ppm;n = 4) and organic Se(Organic Se,0.3 ppm;n = 4).Blood was collected on d-60,57 and 113 of gestation and on d 21 of lactation and milk was collected at d 0,1,7,14,and 21 of lactation.Blood was collected from piglets at d 0,1,7,14,and 21 of age.Gilts fed organic Se had greater(P< 0.05) circulating concentrations of Se than Inorganic and Control gilts.Regardless of treatment,circulating concentrations of Se were greatest fP < 0.05) at d-60 compared to all other days.Serum concentrations of IgG were greatest(P< 0.05) in gilts at d 57 of gestation compared to d 113.Serum concentrations of IgA were greatest(P< 0.05) on d 113 of gestation and d 21 of lactation compared to d-60 and 57.Serum concentrations of IgM were greater(P< 0.05) at d 57 compared to d-60.Inorganic gilts had greater(P< 0.05) colostral and milk concentrations of IgG and IgM than Organic or Control gilts.Circulating concentrations of Se in piglets were greatest(P< 0.05) at d 14 and 21 of age compared to all other days.Piglets from gilts supplemented with organic Se had greater(P < 0.05) circulating concentrations of Se on d 1 versus piglets from gilts supplemented with no additional Se.The immunoglobulin concentrations of IgG,IgA,and IgM were lowest(P< 0.05) on d 0 and then increased when compared to d 1.The addition of different sources of Se did not affect the immunoglobulin concentrations in the gilt or piglet.
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