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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 2006;19(7): 984-991.
DOI: https://doi.org/10.5713/ajas.2006.984    Published online May 25, 2006.
Effects of Spent Composts of Selenium-enriched Mushroom and Sodium Selenite on Plasma Glutathione Peroxidase Activity and Selenium Deposition in Finishing Hanwoo Steers
S. H. Lee, B. Y. Park, Sung S. Lee, N. J. Choi, J. H. Lee, J. M. Yeo, J. K. Ha, W. J. Maeng, W. Y. Kim*
Correspondence:  W. Y. Kim,
Effects of spent composts of selenium-enriched mushroom (Se-SMC) on plasma glutathione peroxidase (GSH-Px) activity and selenium (Se) deposition in finishing Hanwoo (Bos taurus coreanae) steers were investigated. Twenty-five Hanwoo steers (average body weight = 613 kg, average age = 22 months) were allotted to treatments in five groups of five steers per pen for 12 weeks preceding slaughter. Treatments were SMC alone (CON; 0.1 ppm Se), 0.3 ppm (0.3 Se-SMC), 0.6 ppm (0.6 Se-SMC), 0.9 ppm (0.9 Se- SMC), and 0.9 ppm (sodium selenite; SENI) Se. During the experimental period, blood samples were taken to analyze Se concentrations and GSH-Px activities. Muscle and liver samples were collected for analyses of Se contents after slaughter. Dry matter intake and body weight gain were not affected by Se-SMC or sodium selenite supplementation. Selenium concentration in the whole blood and GSH-Px activity in plasma were linearly increased (p<0.01) with increasing levels of Se-SMC. The whole blood Se concentration of SENI treatment was significantly higher (p<0.05) than that of CON treatment from 4 weeks, whereas there was no significant difference in GSH-Px activities between both treatments at 8 and 12 weeks. Selenium content in the hind leg and liver increased linearly (p<0.05) with increasing levels of Se-SMC, but those of SENI treatments were not significantly different from CON treatments. These results suggested that Se in the Se-SMC was highly bioavailable to blood and tissues of ruminants, especially compared with Se in the sodium selenite. Therefore, Se-SMC might be used not only as an inexpensive way of providing Se for ruminants but also as another way of producing Se-fortified beef.
Keywords: Spent Composts of Se-Enriched Mushroom; Sodium Selenite; Glutathione Peroxidase; Selenium Deposition; Hanwoo Steers

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