Effects of Different Selenium Sources on Performance, Carcass Characteristics, Plasma Glutathione Peroxidase Activity and Selenium Deposition in Finishing Hanwoo Steers

  • Lee, S.H. (Department of Animal Science, Korea National Agricultural College, RDA) ;
  • Park, B.Y. (National Livestock Research Institute, RDA) ;
  • Yeo, J.M. (Department of Animal Science, Korea National Agricultural College, RDA) ;
  • Lee, Sung S. (Division of Animal Science and Technology, Gyeongsang National Univerisity) ;
  • Lee, J.H. (Department of Animal Science, Korea National Agricultural College, RDA) ;
  • Ha, J.K. (School of Agricultural Biotechnology, Seoul National University) ;
  • Kim, W.Y. (Department of Animal Science, Korea National Agricultural College, RDA)
  • Received : 2006.05.10
  • Accepted : 2006.08.20
  • Published : 2007.02.01


This study was conducted to determine effects of different selenium (Se) sources on performance, carcass characteristics, blood measures (whole blood Se concentration and plasma glutathione peroxidase (GSH-Px) activity), and Se concentrations in tissues of finishing Hanwoo steers (Korean native steers). Twenty finishing Hanwoo steers (average body weight=536${\pm}$23.4 kg, average age=approximately 20 months) were allotted to treatments in four groups of five steers per pen for 16 weeks preceding slaughter. Treatments were control (CON), spent mushroom composts from Se-enriched mushrooms (Se-SMC), selenized yeast (Se-Y), and sodium selenite (SS). Dietary Se levels of all treatments except CON were 0.9 mg Se/kg on the dry matter basis. Body weight was measured at the first and final day of trial, and blood samples were collected to analyze whole blood Se concentration and plasma GSH-Px activity at 2, 4, 8, and 16 weeks. At the end of trial, steers were slaughtered to collect muscle and liver samples for their Se analyses, and carcass data were recorded. In terms of dry matter intake, body weight gain and carcass characteristics, no significant differences among treatments were observed. Whole blood Se concentrations were significantly higher (p<0.05) for Se-SMC and Se-Y treatments than for CON at each collection period, with no significant difference between SS and CON. For weeks 2 and 8, there was no significant difference for whole blood Se concentration between Se-SMC and Se-Y, but for weeks 4 and 16, Se-Y treatments were significantly higher (p<0.05) than Se-SMC. No differences were observed for plasma GSH-Px activity between Se-SMC and Se-Y. The Se concentrations in hind leg and liver were significantly different among treatments (p<0.05) and those in both tissues ranked the greatest in Se-Y, followed by Se-SMC, SS, and CON treatments. However, tissue Se concentration for SS was not different from that for CON. These results showed that feeding organic Se sources such as Se-SMC and Se-Y enhanced Se concentration in tissues, while SS, the most common supplement of inorganic Se, was inefficient in Se deposition. Even though Se-Y had a higher Se concentration in tissues than Se-SMC, replacing Se-Y with Se-SMC in diets of beef steers would be an inexpensive way to increase Se concentration in beef.


Se-SMC;Selenized Yeast;Sodium Selenite;Plasma GSH-Px;Se Deposition;Hanwoo Steers


Supported by : Ministry of Agriculture and Forestry in Korea


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