Effect of Increasing the Level of Inorganic Selenium Supplementation in the Post-weaning Diets of Swine

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Abstract
A 2 × 4 × 2 factorial experiment was conducted with the pigs from sows fed diets with (.1 ppm) or without supplemental inorganic Se (sodium selenite). Four post-weaning treatments with both progeny groups evaluated the efficacy of supplemental inorganic Se on pig performance and serum and tissue Se concentrations. Three diets contained either 0, .1 or .3 ppm supplemental Se; a fourth group was fed the negative (0) control diet but provided with drinking water containing .34 ppm inorganic Se. After a 4-week post-weaning period the pigs were reallotted into two groups and fed diets either with (.1 ppm) or without supplemental Se. Pigs were bled and sacrificed for tissue collection at periodic intervals for Se status determinations. Progeny from sows fed Se had higher serum, hepatic, kidney and longissimus muscle tissue Se concentrations at weaning than those from the non-Se fortified dam group. Serum Se declined within 7-days post-weaning for the progeny of both sow groups when supplemental Se was not provided in the post-weaning diet. When the .1 ppm level was fed, serum Se increased linearly over the 4-week test period for the progeny of the non-Se sow group but remained similar to the weaning levels for the pigs of the other sow group. When the .3 ppm Se level was fed, serum concentrations increased and plateaued by 14- to 21-days post-weaning. At the end of the post-weaning period hepatic tissue Se increased linearly as dietary Se levels were elevated with kidney and longissimus muscle tissue quadratically plateauing at .1 ppm Se. The results suggested that kidney clearance threshold levels were attained at the .1 ppm Se level and that added dietary levels resulted in Se accumulation in hepatic tissue. Serum Se levels increased by 7-days post-weaning when Se was provided in the drinking water; hepatic tissue Se concentration was also higher at the end of the test period. Serum Se levels were elevated during the growing-finishing period as were tissue Se, when supplemental Se was provided in these latter diets. Concentrations were not influenced by previous treatment. Copyright © 1978. American Society of Animal Science . Copyright 1978 by American Society of Animal Science.