Effects of different sources of selenium supplementation on antioxidant indices, biochemical parameters, thyroid hormones and Se status in transition cows

Mohsen Khalili; Mohammad Chamani; Hamid Amanlou; Ali Nikkhah; Ali Asghar Sadeghi

doi:10.4025/actascianimsci.v41i1.44392

Mohsen Khalili Islamic Azad University
Mohammad Chamani Islamic Azad University http://orcid.org/0000-0001-8631-127X
Hamid Amanlou University of Zanjan
Ali Nikkhah Islamic Azad University
Ali Asghar Sadeghi Islamic Azad University

DOI: https://doi.org/10.4025/actascianimsci.v41i1.44392

Resumo

The aim of this study was to determine the effects of supplementing close-up and fresh dairy cows’ diets with sodium selenite or organic sources of selenium (Se) on the serum biochemical parameters and antioxidant indicators and Se status. Twenty-four multiparous Holstein dairy cows were balanced by body condition score (BCS), previous lactation milk yield and expected calving date and randomly assigned to 1 of 4 experimental treatments. Treatments were: control (basal diet without Se supplementation), sodium selenite supplementation (0.50 mg of Se kg^-1 DM; Se-S), selenium yeast supplementation (0.50 mg of Se kg^-1 DM; Se-Y) and selenomethionine supplementation (0.50 mg of Se kg^-1 DM; Se-M). Serum Se concentrations were higher for cows in Se-Y (72.34 µg dL^-1) and Se-Met (72.34 µg dL^-1) than control (59.93µg/dl) and Se-S (64.79µg/dl). The Se supplementation and sources did not affect serum metabolites or indices of antioxidant pre and postpartum, except serum total protein and albumin concentrations. Cows in Se-M had greater serum total protein and albumin concentrations than those in control. The results of present study showed that serum Se concentrations increased in Se-Y and Se–M more effectively than Se-S, indicating that selenomethionine could replace Se-S as an effective organic Se source for transition dairy cows.

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