Effects of dietary Cu,Mo and S on urinary Cu and Zn excretion in Simmental and Angus cattle |
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| Affiliation: | 1. Faculty of Agriculture and Life Sciences, P.O. Box 84, Lincoln University, Lincoln 7647, New Zealand;2. Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A8;1. Department of Chemistry, Faculty of Science, University of Qom, Qom, Iran;2. Department of Chemistry, Faculty of Science, Payame Noor University, Iran;3. Farhangian University, Shahid Magsoudi Branch, Hamedan, Iran;1. Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada;2. Livestock Research & Extension Branch, Alberta Agriculture and Forestry, Edmonton, AB T6H 5T6, Canada;1. Department of Animal Biosystem Sciences, Chungnam National University, Daejeon 305-764, Republic of Korea;2. CTC Bio Inc., Seoul, Republic of Korea;1. Baylor St Luke’s Medical Center, 6720 Bertner Avenue, MC 4-278, Box 77, Houston, TX 77030, USA;2. Cardiovascular Recovery Room, Baylor St Luke’s Medical Center, 6720 Bertner Avenue, MC 4-278, Box 192, Houston, TX 77030, USA |
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| Abstract: | This study determined the effects of dietary copper (Cu), molybdenum (Mo) and sulphur (S) on urinary Cu and zinc (Zn) excretion in cattle. Four Simmental and four Angus heifers were fed low (L) or high (H) levels (mg/kg DM) of Cu (5, 40), Mo (1, 10) and S (0.2, 0.5%). Initially two of each breed was fed either LCu or HCu (2 mo). Then all eight animals were fed sequentially LCu HS (1.5 mo), HCuHS, HCuHMo and HCuHMoHS (2 mo each). Simmental had a higher urine flow, increased concentration and total excretion of urinary Cu and Zn compared to Angus, but only total Zn excretion was significantly higher. Urinary Cu excretion was greatest with the HCuHMoHS diet. Urinary Zn excretion significantly increased with HS but not HS in combination with HMo and/or HCu. This study, together with previously reported biliary excretion, allows a direct comparison of urinary and biliary Cu and Zn excretion responses to dietary Cu, Mo and S. |
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