title: Associations of sole ulcer at claw trimming with reproductive performance, udder health, milk yield, and culling in Swedish dairy cattle.
abstract: The association between sole ulcer found at routine claw trimming 2-6 months after calving and reproductive, health and productive traits in the same lactation, was investigated in an observational study of 2368 dairy cows in 102 Swedish herds. The data were analysed by mixed multivariable linear-, logistic- and Poisson-regression modelling at the cow level, accounting for clustering within herd. Associations were found between sole ulcer and first-service conception risk in the first study year (OR 0.59), calving interval (2% longer), treatment for anoestrus (OR 1.61), and 305-day milk yield (479 kg ECM higher). No associations could be shown between sole ulcer and first-service conception risk in the second study year, the number of services per conception, clinical mastitis, high milk somatic-cell counts or culling.
authors.affiliation: Department of Animal Environment and Health, Section of Production Diseases, Swedish University of Agricultural Sciences, P.O. Box 234, SE-532 23 Skara, Sweden. jan.hultgren@hmh.slu.se
authors.forename: Jan
authors.initials: J
authors.lastname: Hultgren
authors.forename: Thomas
authors.initials: T
authors.lastname: Manske
authors.forename: Christer
authors.initials: C
authors.lastname: Bergsten
mesh_terms: D000822:Animal Husbandry / Q000379:methods; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000209:etiology / Q000517:prevention & control; D003612:Dairying; D005260:Female; D005534:Foot Diseases / Q000453:epidemiology / Q000517:prevention & control / Q000662:veterinary*; D006724:Hoof and Claw / Q000601:surgery; D007774:Lactation; D008321:Mammary Glands, Animal; D016012:Poisson Distribution; D011247:Pregnancy; D012098:Reproduction; D013548:Sweden / Q000453:epidemiology