tailieunhanh - Báo cáo khoa học: "Blood Selenium Associated with Health and Fertility in Norwegian Dairy Herds"

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 y đề tài: Blood Selenium Associated with Health and Fertility in Norwegian Dairy Herds. | Acta vet. scand. 2005 46 229-240. Blood Selenium Associated with Health and Fertility in Norwegian Dairy Herds By E. Kommisrud1 O. 0steras2 3 1Geno Breeding and AI Association Hamar Norway 2TINE Norwegian Dairies BA Ẳs Norway 3Norwegian School of Veterinary Science Oslo. Kommisrud E Osterâs O Vatn T Blood selenium associated with health and fertility in Norwegian dairy herds. Acta vet. scand. 2005 46 229-240. - A survey of blood selenium Se concentrations in Norwegian Red heifers and dry period cows was conducted to reveal possible association to management feeding health and fertility. Selenium contents were determined in 254 herd blood samples consisting of pooled samples from individual non-lactating animals from herds in 5 counties. The Se concentrations showed a normal distribution with mean pg Se g blood with a standard deviation SD of and ranged from to pg g with 50 of the samples being between and pg g. The herds with Se concentrations below pg g were smaller cow-years than those with Se levels above pg g cow-years P but there were no differences in milk yield incidence of replacement proportion of animal culling amount of concentrate or grass silage as percentage of energy consumption between the groups. Treatment registration records showed a tendency that more animals in the low Se herds were treated for all the diseases included in this investigation animals per 100 cow-years than those in the high Se herds per 100 cow-years while no such differences were revealed for individual disorders. There was however a significant difference in bulk milk somatic cell counts BM-SCC between low and high Se herds their values being 137 000 and 155 000 cells ml respectively. This difference was significantly influenced by herd size. Furthermore a total of 4 916 lactations were analyzed from individual health and fertility recordings including 2 934 first lactations and 1 982 later .

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