Journal
JOURNAL OF TRACE ELEMENTS IN MEDICINE AND BIOLOGY
Volume 50, Issue -, Pages 527-536Publisher
ELSEVIER GMBH
DOI: 10.1016/j.jtemb.2018.03.003
Keywords
Fast growth; Finishing pig; Gene expression; L-selenomethionine; Lipopolysaccharide; mRNA; Oxidative stress; Selenium; Skeletal muscle; Sodium selenite; Selenoprotein
Funding
- Norwegian Levy on Agricultural Products (FFL) [233658]
- Agricultural Agreement Research Fund of Norway [233658]
- Norwegian feed industry (Felleskjopet) [233658]
- Norwegian feed industry (Norgesfor) [233658]
- Norwegian agricultural cooperative Nortura [233658]
- Meat and Poultry Association KLF [233658]
- Norwegian Poultry and Meat Research Center (Animalia) [233658]
- Norwegian feed industry (Fiska Molle) [233658]
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The study was conducted to compare effects of different dietary Se sources (sodium selenite [NaSe], Se-enriched yeast [Se yeast] or L-selenomethionine [SeMet]) and one Se-deficient control diet on the expression of selected genes, hematological and clinical biochemical parameters, and muscle morphology in two parallel trials with finisher pigs. Se concentrations in blood plasma and tissues were also monitored. From the pigs in one of the parallel groups, muscle samples obtained from Musculus longissimus dorsi (LD) before and during the trial were examined. The pigs in the other parallel group were challenged once with lipopolysaccharide (LPS) intravenously. Transcriptional analyses of LD showed that selenogenes SelenoW and H were higher expressed in pigs fed Se supplemented diets compared with control. Furthermore, the expression of interferon gamma and cyclooxygenase 2 was lower in the Se-supplemented pigs versus control. In whole blood samples prior to LPS, SelenoN, SelenoS and thioredoxin reductase 1 were higher expressed in pigs fed NaSe supplemented feed compared with the other groups, possibly indicating a higher level of oxidative stress. After LPS exposure glutathione peroxidase 1 and SelenoN were more reduced in pigs fed NaSe compared with pigs fed organic Se. Products of most above mentioned genes are intertwined with the oxidant-antioxidant system. No significant effects of Se-source were found on hematologic parameters or microscopic anatomy. The Se-concentrations in various skeletal muscles and heart muscle were significantly different between the groups, with highest concentrations in pigs fed SeMet, followed by those fed Se yeast, NaSe, and control diet. Consistent with previous reports our results indicate that dietary Se at adequate levels can support the body's antioxidant system. Our results indicate that muscle fibers of pigs fed organic Se are less vulnerable to oxidative stress compared with the other groups.
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