title: Relations between on-line electrical conductivity and daily milk production on a low somatic cell count farm.
abstract: To study the relation between on-line electrical conductivity and daily milk production, data of 1389 cow days were analyzed. After correction for cow effects and DIM, a rise of 1 mS of the mean electrical conductivity caused a decline of .88 kg/d in milk production. A rise of 1 ln(SCC) unit was associated with an additional decline of .54 kg/d in milk production. In cows without clinical mastitis during the test period, the losses associated with mean electrical conductivity and ln(SCC) were 1.06 and .45 kg/d of milk production, respectively. Electrical conductivity and SCC were associated with daily production loss; the effects were additive. Therefore, electrical conductivity and SCC can be utilized as indirect tests of subclinical mastitis.
authors.affiliation: Department of Herd Health and Reproduction, Utrecht University, The Netherlands.
authors.forename: M
authors.initials: M
authors.lastname: Nielen
authors.forename: Y H
authors.initials: YH
authors.lastname: Schukken
authors.forename: J
authors.initials: J
authors.lastname: Van de Broek
authors.forename: A
authors.initials: A
authors.lastname: Brand
authors.forename: H A
authors.initials: HA
authors.lastname: Deluyker
authors.forename: K
authors.initials: K
authors.lastname: Maatje
mesh_terms: D000818:Animals; D002417:Cattle; D004553:Electric Conductivity; D004926:Escherichia coli / Q000302:isolation & purification; D005260:Female; D007774:Lactation; D008414:Mastitis, Bovine / Q000382:microbiology / Q000473:pathology / Q000503:physiopathology*; D008892:Milk / Q000166:cytology / Q000382:microbiology / Q000502:physiology*; D013211:Staphylococcus aureus / Q000302:isolation & purification