tailieunhanh - Báo cáo khoa học: "Hepatic Cobalt and Copper Levels in Lambs in Norway"

Tuyển tập các báo cáo nghiên cứu về bệnh thú y được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành thú y đề tài: Hepatic Cobalt and Copper Levels in Lambs in Norway. | Acta vet. scand. 2004 45 69-77. Hepatic Cobalt and Copper Levels in Lambs in Norway By T. Sivertsen1 and C. Plassen2 Department of Production Animal Clinical Sciences Norwegian School of Veterinary Science and 2Department of Chemistry National Veterinary Institute Oslo Norway. Sivertsen T Plassen C Hepatic cobalt and copper levels in lambs in Norway. Acta vet. scand. 2004 45 69-77. - Cobalt and copper concentrations were measured in 599 lamb livers collected at slaughter from 58 sheep flocks in 6 different parts of Norway in 1993. Information about pasture additional feeding and mineral supplements in the flocks was obtained through a questionnaire. Average hepatic levels of cobalt in the lamb flocks varied from to pg g ww and of copper from 5 to 240 pg g ww. Flocks with deficient or marginal cobalt status were found in all parts of southern Norway but primarily in the west and south-west. Some flocks with marginal copper status were found in the south-west while flocks with signs of excessive hepatic copper concentrations were found mainly in inner parts of central and northern Norway. Hepatic copper concentrations were significantly higher in lambs that had grazed mountain pastures than in those that had grazed lowland pastures in the summer. cobalt deficiency copper poisoning copper deficiency trace elements lambs pasture Norway. Introduction Cobalt deficiency in the form of ovine whiteliver disease OWLD is a documented problem in lambs grazing cultivated pastures in the south-western parts of Norway Ulvund 1990a . Through research and dissemination of information the Section for Small Ruminant Diseases of the Norwegian School of Veterinary Science has made sheep farmers in this area aware of the problem. Some cases are reported from other Norwegian coastal districts Ulvund 1995 Ulvund Pestalozzi 1996 . In the inland districts the disease has almost never been reported. However as the primary sign of the disease is simply illthrift in grazing lambs it