Lamb Muscle Selenium Concentration Plateaus Following 56 days of SeleniumSupplementation
Proceedings Western Section American Society of Animal Science
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,
Schauer CS, Held J, Damiels JA, Caton JS, Hatfield PG, Stobart R, and Hall JO. Lamb Muscle Selenium Concentration Plateaus Following 56 days of Selenium Supplementation. Proceedings of the Western Section of the American Society of Animal Science 78th Annual Meeting. 57:339-342, 2006.