Longitudinal study of the effects of teat condition on the risk of new intramammary infections in dairy cows
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Longitudinal study of the effects of teat condition on the risk of new intramammary infections in dairy cows. / Zoche-Golob, V; Haverkamp, H; Paduch, J-H; Klocke, D; Zinke, C; Hoedemaker, M; Heuwieser, W; Krömker, V.
In: Journal of Dairy Science, Vol. 98, No. 2, 02.2015, p. 910-7.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Longitudinal study of the effects of teat condition on the risk of new intramammary infections in dairy cows
AU - Zoche-Golob, V
AU - Haverkamp, H
AU - Paduch, J-H
AU - Klocke, D
AU - Zinke, C
AU - Hoedemaker, M
AU - Heuwieser, W
AU - Krömker, V
N1 - Copyright © 2015 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.
PY - 2015/2
Y1 - 2015/2
N2 - Machine milking-induced alterations of teat tissue may impair local defense mechanisms and increase the risk of new intramammary infections. The objective of the current study was to assess the influence of short-term and long-term alterations of teat tissue and infectious status of the udder quarter on the risk of naturally occurring new intramammary infections, inflammatory responses, and mastitis. Short-term and long-term changes in teat condition of right udder quarters of 135 cows of a commercial dairy farm in Saxony-Anhalt, Germany, were recorded monthly for 10 mo using simple classification schemes. Quarter milk samples were collected from all examined quarters at each farm visit. Bacteriological culture results and somatic cell counts of quarter milk samples were used to determine new inflammatory responses (increase from ≤100,000 cells/mL to >100,000 cells/mL between 2 samples), new infections (detection of a pathogen from a quarter that was free of the same pathogen at the preceding sampling), and new mastitis (combination of new inflammatory response and new infection). Separate Poisson mixed models for new inflammatory responses, new infections, and new mastitis caused by specific pathogens or groups of pathogens (contagious, environmental, major, minor, or any) were used to estimate risk ratios and 95% confidence intervals. Data preparation and parameter estimation were performed using the open source statistical analysis software R. We observed no effect of any variable describing teat condition on the risk of new intramammary infections, inflammatory responses, or mastitis. Intramammary infections of the same udder quarter in the preceding month did not affect risk either.
AB - Machine milking-induced alterations of teat tissue may impair local defense mechanisms and increase the risk of new intramammary infections. The objective of the current study was to assess the influence of short-term and long-term alterations of teat tissue and infectious status of the udder quarter on the risk of naturally occurring new intramammary infections, inflammatory responses, and mastitis. Short-term and long-term changes in teat condition of right udder quarters of 135 cows of a commercial dairy farm in Saxony-Anhalt, Germany, were recorded monthly for 10 mo using simple classification schemes. Quarter milk samples were collected from all examined quarters at each farm visit. Bacteriological culture results and somatic cell counts of quarter milk samples were used to determine new inflammatory responses (increase from ≤100,000 cells/mL to >100,000 cells/mL between 2 samples), new infections (detection of a pathogen from a quarter that was free of the same pathogen at the preceding sampling), and new mastitis (combination of new inflammatory response and new infection). Separate Poisson mixed models for new inflammatory responses, new infections, and new mastitis caused by specific pathogens or groups of pathogens (contagious, environmental, major, minor, or any) were used to estimate risk ratios and 95% confidence intervals. Data preparation and parameter estimation were performed using the open source statistical analysis software R. We observed no effect of any variable describing teat condition on the risk of new intramammary infections, inflammatory responses, or mastitis. Intramammary infections of the same udder quarter in the preceding month did not affect risk either.
KW - Animals
KW - Cattle
KW - Dairying
KW - Edema/physiopathology
KW - Female
KW - Germany
KW - Longitudinal Studies
KW - Mammary Glands, Animal/microbiology
KW - Mastitis, Bovine/microbiology
KW - Milk/metabolism
KW - Risk
U2 - 10.3168/jds.2014-8446
DO - 10.3168/jds.2014-8446
M3 - Journal article
C2 - 25497817
VL - 98
SP - 910
EP - 917
JO - Journal of Dairy Science
JF - Journal of Dairy Science
SN - 0022-0302
IS - 2
ER -
ID: 237052261