{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,6,13]],"date-time":"2025-06-13T15:10:04Z","timestamp":1749827404654,"version":"3.41.0"},"reference-count":13,"publisher":"Akademiai Kiado Zrt.","issue":"2","content-domain":{"domain":["akjournals.com"],"crossmark-restriction":true},"short-container-title":["AVet"],"published-print":{"date-parts":[[2025,6,13]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Gastrointestinal nematodes (GINs), such as <jats:italic>Ostertagia ostertagi<\/jats:italic> and <jats:italic>Cooperia<\/jats:italic> spp., are common in cattle worldwide. Although infected cattle are often asymptomatic, production is negatively affected. The present study investigated whether eggs per gram (EPG) of GINs in 32 lactating cows decreased during winter and increased as it became warmer. Larvae recovered by coprocultures mostly consisted of <jats:italic>O. ostertagi<\/jats:italic> in autumn, while three GINs, <jats:italic>Ostertagia<\/jats:italic>, <jats:italic>Trichostrongylus<\/jats:italic> and <jats:italic>Meistocirrus<\/jats:italic>, were\u00a0collected in spring. Daily milk and bulk tank milk samples from cows previously infected with <jats:italic>O<\/jats:italic>.\u00a0<jats:italic>ostertagi<\/jats:italic> contained <jats:italic>O<\/jats:italic>. <jats:italic>ostertagi<\/jats:italic> antibodies based on ELISA developed using SVANOVIER\u00ae <jats:italic>O<\/jats:italic>.\u00a0<jats:italic>ostertagi<\/jats:italic>-Ab in all survey periods. Even if the faecal diagnosis was negative for GINs, infection was still possible. Therefore, the administration of anthelmintic drugs is recommended.<\/jats:p>","DOI":"10.1556\/004.2025.01144","type":"journal-article","created":{"date-parts":[[2025,4,30]],"date-time":"2025-04-30T11:18:33Z","timestamp":1746011913000},"page":"130-133","update-policy":"https:\/\/doi.org\/10.1556\/policypage.crossmark.crossref.2","source":"Crossref","is-referenced-by-count":0,"title":["Seasonal dynamics of Ostertagia ostertagi infection in lactating Holstein-Friesian cows on\u00a0a\u00a0dairy farm in Hokkaido, Japan"],"prefix":"10.1556","volume":"73","author":[{"given":"Keiko","family":"Ikeda","sequence":"first","affiliation":[{"name":"The Graduate School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yasuhito","family":"Asakura","sequence":"additional","affiliation":[{"name":"Rumoi Hokubu Veterinary Clinic, Hokkaido Chuo Agricultural Mutual Relief Association, Teshio, Hokkaido, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shinichiro","family":"Fukumoto","sequence":"additional","affiliation":[{"name":"The Graduate School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuyuki","family":"Suzuki","sequence":"additional","affiliation":[{"name":"The Graduate School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6611-9483","authenticated-orcid":true,"given":"Haruyuki","family":"Hirata","sequence":"additional","affiliation":[{"name":"The Graduate School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"425","reference":[{"key":"B1","series-title":"Vet. 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