TAILIEUCHUNG - Báo cáo thú y: "The distribution of four trace elements (Fe, Mn, Cu, Zn) in forage and the relation to scrapie in Iceland"

Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú y đề tài: The distribution of four trace elements (Fe, Mn, Cu, Zn) in forage and the relation to scrapie in Iceland. | Eiríksson etal. Acta VeterinariaScandinavica 2010 52 34 http content 52 1 34 AVS ACTA VETERINARIA Scatand n SCANDINAVICA RESEARCH Open Access The distribution of four trace elements Fe Mn Cu Zn in forage and the relation to scrapie in Iceland Tryggvi Eiríksson1 Hólmgeir Bjornsson1 Kristin Bjorg Gudmundsdóttir 2 Jakob Kristinsson3 and Torkell Jóhannesson 3 Abstract Background Previous studies indicated that the iron Fe manganese Mn ratio in forage of sheep was significantly higher on scrapie-afflicted farms than on farms in other scrapie categories. This study was conducted to examine whether Fe and Mn in forage of sheep varied in general according to the scrapie status of different areas in the country. Copper Cu and zinc Zn were also included because of a possible relation to scrapie. Methods The country was subdivided into seven Areas I-VII . Three Areas I IV VII were designated scrapie-free never diagnosed or eradicated and three as scrapie-endemic II III VI status of Area V was taken as unsettled. Of the harvest 2007 1552 samples were analysed from 344 farms all over the country mostly grass silage from plastic bales 90 and from the first cut 70 or more . Results were expressed as mg kg-1 dry matter. Results Fe varied enormously from less than 100 mg kg-1 to 5000 mg kg-1. Mn varied nearly thirtyfold 17-470 mg kg-1 . Fe concentration was significantly lower in Area I than in Areas II V and VI. Mn concentration was significantly higher in Areas I IV and VII than in Areas II III V and VI. The Fe Mn ratio was significantly less in Area I than in the other areas except Area IV . Mean Cu concentration was mg kg-1 and the mean Zn concentration was 24-29 mg kg-1. They differed significantly in some areas. Conclusions 1 Fe tended to be in lower amounts in sheep forage in scrapie-free than in endemic areas 2 Mn was in higher amounts in forage in scrapie-free than endemic areas 3 the Fe Mn ratio was lower in scrapie-free than in endemic areas

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