Lamb Muscle Selenium Concentration Plateaus Following 56 days of SeleniumSupplementation

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Proceedings Western Section American Society of Animal Science



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Researchers have determined that dietary selenium (Se) affects the Se concentration of skeletal muscle in ruminants. Current research suggests that humans who consume 2 to 4 fold of the recommended dietary allowance (RDA = 55 µg Se/d) of Se may reduce their chance for developing lung, colorectal, and prostate cancer by 30, 50, and 70%, respectively. However, limited data are available describing the effects of length of supra- selenium supplementation to lambs on selenium status, feedlot performance, or carcass characteristics. Our objectives were to evaluate the influence of length of supra- selenium supplementation on muscle and plasma Se status, feedlot performance, and carcass characteristics of finishing lambs. One-hundred sixty wethers (35 ± 0.3 kg BW) were stratified by weight, randomly allotted to one of 20 pens, and assigned one of five treatments (n = 4): supra-selenium supplementation with selenoyeast for the final 84, 56, 28, 14, or 0 d (CON) of finishing. Diets were similar in ingredient composition (73% corn, 25% alfalfa, 2% supplement; DM basis), isonitrogenous and isocaloric, and offered once daily (0800) to provide ad libitum intake. Daily selenium intake for CON and supra-selenium supplemented wethers was 4 and 50 µg Se·kg -1 BW·d -1,

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