title: Bulk tank milk somatic cell counts in dairy herds with different bovine viral diarrhoea virus status in Poland.
abstract: The aim of the study was to examine the effect of bovine viral diarrhoea virus (BVDV) infection on bulk tank milk somatic cell counts (BMSCC). Twenty nine dairy farms supplying milk to a dairy in Eastern Poland were recruited for the study. Bulk milk ELISA and RT-PCR were used to determine the BVDV infection status and the presence of PI animals in the farms. The BMSCC mean values for the BVDV seronegative (218.7 × 10(3)cells/ml; SD: 89.8) and seropositive (214.9 × 10(3)cells/ml; SD: 74.0) herds did not differ significantly. To assess the relationship between BVDV infection and BMSCC a multilevel mixed-effects linear model was used. No statistically significant effect of BVDV infection on BMSCC was found. The mean values of BMSCC for the herds with PI individuals measured before (230.1 × 10(3)cells/ml, SD: 64.9) and after (223.3 × 10(3)cells/ml, SD: 62.4) the PI removal were not statistically different. An increase in herd size was associated with a significant decrease in BMSCC. An increase in BMSCC was observed during summer (from May to September) compared to during winter (from October to April).
authors.affiliation: Department of Hygiene of Food of Animal Origin, National Veterinary Research Institute, Al. Partyzantow 57, 24-100 Pulawy, Poland. Electronic address: jolarola@piwet.pulawy.pl.
authors.forename: Jolanta G
authors.initials: JG
authors.lastname: Rola
authors.affiliation: Department of Virology, National Veterinary Research Institute, Al. Partyzantow 57, 24-100 Pulawy, Poland.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Larska
authors.affiliation: Spomlek Dairy Cooperative, ul. Gen. F. Kleeberga 12, 21-300 Radzyn Podlaski, Poland.
authors.forename: Monika
authors.initials: M
authors.lastname: Grzeszuk
authors.affiliation: Department of Epidemiology and Risk Assessment, National Veterinary Research Institute, Al. Partyzantow 57, 24-100 Pulawy, Poland.
authors.forename: Lukasz
authors.initials: L
authors.lastname: Bocian
authors.affiliation: Department of Virology, National Veterinary Research Institute, Al. Partyzantow 57, 24-100 Pulawy, Poland.
authors.forename: Aleksandra
authors.initials: A
authors.lastname: Kuta
authors.affiliation: Department of Virology, National Veterinary Research Institute, Al. Partyzantow 57, 24-100 Pulawy, Poland.
authors.forename: Miroslaw P
authors.initials: MP
authors.lastname: Polak
authors.affiliation: Department of Virology, National Veterinary Research Institute, Al. Partyzantow 57, 24-100 Pulawy, Poland.
authors.forename: Jerzy
authors.initials: J
authors.lastname: Rola
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D001912:Bovine Virus Diarrhea-Mucosal Disease / Q000453:epidemiology* / Q000821:virology; D002417:Cattle; D002452:Cell Count / Q000662:veterinary; D003612:Dairying; D001908:Diarrhea Viruses, Bovine Viral / Q000302:isolation & purification*; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D005260:Female; D008892:Milk / Q000737:chemistry* / Q000382:microbiology; D011044:Poland / Q000453:epidemiology; D016133:Polymerase Chain Reaction / Q000662:veterinary
chemical_list: D000914:Antibodies, Viral
keywords: Bovine viral diarrhoea virus; Bulk tank milk; Somatic cell count