Stimulatory effects of nano-selenium and conjugated linoleic acid ‎ on antioxidant activity, trace minerals, and gene expression response of growing male Moghani lambs

Sheep keepers need suitable strategies to improve animal immunity and the quality of their products. This study was aimed to evaluate the effect of nano-selenium (nano-Se) and conjugated linoleic acid (CLA) on an antioxidant statue, trace minerals, and mRNA expression of glutathione peroxidase ۱ (GPX۱) and selenoprotein W۱ (SEPW۱) genes in the liver and peroxisome proliferator-activated receptor-gamma (PPARγ) and stearoyl COA desaturase ۱ (SCD۱) genes in fat- tail of male Moghani lambs. Thirty male Moghani lambs, three months old and average weight ۳۰.۰۰ ± ۰.۲۵ kg, were assigned to a completely randomized design in a ۲×۳ factorial arrangement with dietary supplementation of nano-Se (۰, ۱.۰۰ and ۲.۰۰ mg kg-۱ dry matter) and CLA (۰ and ۱۵.۰۰ g kg-۱ dry matter). The lambs were slaughtered at the end of the experiment, on day ۹۰ of the experiment. Results showed that dietary inclusion of nano-Se significantly improved antioxidant enzymes glutathione peroxidase and superoxide dismutase in blood, however, did not show any differences in trace mineral treatments. The analysis of qPCR showed that nano-Se inclusion at the highest level (۲.۰۰ g kg-۱ dry matter) enhanced gene expression of GPX۱ (۰.۶۴ vs ۰.۳۴) and SEPW۱ ۱ (۰.۷۲ vs ۰.۳۵) in the liver. Dietary inclusion of CLA increased the expression of PPARγ (۰.۶۳ vs ۰.۳۸) and decreased SCD۱ (۰.۶۳ vs ۰.۳۳) genes in fat- tail. It could be concluded that selenium inclusion in the growing lamb’s diet could improve antioxidant status, however, no synergistic interaction was observed along with CLA on the mentioned parameters.

Keywords:

Antioxidant enzymes , ‎ Diet supplementation , ‎ Gene expression , ‎ Glutathione peroxidase , ‎ Selenium