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- W3013754871 abstract "To determine the prevalence, mean fecal egg count intensities, and predominant gastrointestinal nematode species, fresh environmental fecal samples were collected from 30 grazing heifers at monthly intervals (June, July, and August) on 6 Saskatchewan dairy farms in 2016. The population average strongylid prevalence ranged from 67.2% [95% confidence interval (CI): 49.5% to 84.9%] in June to 88.3% (95% CI: 76.7% to 100.0%) in August (P = 0.05) while the mean fecal egg count ranged from 1.7 in June to 9.3 eggs/g of feces in August (P < 0.003). The predominant nematode species were identified using a deep-sequencing nemabiome assay targeting the internal transcribed spacer rDNA genomic locus of both L1 and L3-stage larvae. Cooperia oncophora and Ostertagia ostertagi were predominant on all farms, accounting for > 85% of the species. The results provide important previously unavailable data on the epidemiology of gastrointestinal nematodes (GIN) in fecal samples from these grazing heifers in Saskatchewan.Examen des nématodes gastro-intestinaux chez les génisses en âge de se reproduire sur six fermes laitières de la Saskatchewan. Afin de déterminer la prévalence, l’intensité du dénombrement moyen d’oeufs dans les fèces et les espèces de nématodes gastro-intestinaux prédominants, des échantillons environnementaux de fèces fraîches furent prélevés de 30 génisses au pâturage à un intervalle mensuel (juin, juillet, et août) sur six fermes laitières de la Saskatchewan en 2016. La prévalence de la population moyenne de strongyles variait de 67,2 % [intervalle de confiance de 95 % (CI) : 49,5 % à 84,9 %] en juin à 88,3 % (CI 95 % : 76,7 % à 100,0 %) en août (P = 0,05) alors que le dénombrement moyen des oeufs dans les fèces variait de 1,7 en juin à 9,3 oeufs/g de fèces en août (P < 0,003). Les espèces de nématodes prédominantes furent identifiées à l’aide d’un test de séquençage profond du némabiome visant l’ADNr du locus génomique de l’espaceur interne transcrit des stades larvaires L1 et L3. Cooperia oncophora et Ostertagia ostertagi étaient prédominants sur toutes les fermes, représentant > 85 % des espèces. Ces résultats fournissent des données importantes non-disponibles auparavant sur l’épidémiologie de GIN dans des échantillons de fèces provenant de ces génisses au pâturage en Saskatchewan.(Traduit par Dr Serge Messier)." @default.
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- W3013754871 date "2019-12-01" @default.
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- W3013754871 title "Survey of gastrointestinal nematodes in breeding-age heifers on 6 Saskatchewan dairy farms." @default.
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