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Acta Veterinaria Scandinavica volume 65 , Article number: 52 Cite this article. Metrics details. The gastrointestinal nematode GIN Ostertagia ostertagi can cause severe disease in first season grazers FSG and impaired performance due to subclinical infections in adult cows. Diagnostic methods to assess exposure include faecal egg count and detection of specific antibodies using antibody-ELISAs resulting in an optical density ratio ODR.
Appropriate use of diagnostic methods for evaluation of O. The aim of this study was to describe the relationship between different diagnostic tests used to assess GIN exposure in Norwegian production systems. A cross-sectional field study was carried out in twenty herds in Norway in the fall of Serum and faecal samples were taken from individuals, of which were FSG and were cows.
In addition, milk was collected from every cow and one BTM sample was taken from each herd. Faecal egg counts were performed. The data were analysed using visual assessment of scatter plots, Pearson correlation coefficients and linear regression. A high variability of the within-herd individual ODR values in serum and milk in every herd was detected.
The gastrointestinal nematode GIN Ostertagia ostertagi is among the most important parasites contributing to bovine parasitic gastroenteritis in temperate and subtropical regions [ 1 ]. The developing larvae destroy the glandular tissue in the abomasum compromising digestion [ 2 ]. Severe disease can occur in first season grazers FSG , whereas in adult animals, subclinical infections associated with economic losses due to impaired performance including reduced milk yield are common [ 3 , 4 , 5 , 6 ].