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Abstract
This study evaluated the effects of sodium selenite (SS) and coated SS (CSS) addition on performance, ruminal fermentation, nutrient digestibility and hepatic gene expression related to lipid metabolism in dairy bulls. Thirty-six Holstein bulls were randomly divided into three groups: without Se addition, addition of 0.3 mg/kg dry matter (DM) of Se from SS and addition of 0.3 mg/kg DM of Se from CSS, respectively. Dietary Se addition increased DM intake. Higher average daily gain and lower feed conversion ratio was observed for CSS addition. Ruminal pH and acetate to propionate ratio decreased, total volatile fatty acids concentration increased but ammonia-N concentration was unchanged with dietary Se addition. Apparent total-tract digestibility of DM, organic matter and crude protein was highest for CSS addition, followed by SS addition and then control. Bulls receiving Se addition had higher digestibility of ether extract, neutral detergent fibre and acid detergent fibre. Serum glucose and glutathione peroxidase and hepatic expression of peroxisome proliferator-activated receptor-α, sterol regulatory element-binding protein-1, carnitine palmitoyl transferase-1 and acetyl-CoA carboxylase-α was highest for CSS addition, followed by SS addition and then control. Bulls receiving CSS addition had higher serum total protein, albumin, triglyceride and total antioxigenic capacity. Addition of Se increased serum cholesterol, insulin and Se. Hepatic expression of stearoyl-CoA desaturase and 3‑hydroxy‑3-methylglutaryl-CoA reductase and Se content increased but content of total lipid and triglyceride was unchanged with Se addition. The data indicated that addition of Se increased performance and hepatic expression of gene related to lipid metabolism in bulls.
Published Version
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