Home About Browse Search
Svenska


Herd-level risk factors associated with cow mortality in Swedish dairy herds

Alvåsen, Karin and Jansson Mörk, Marie and Hallén Sandgren , Charlotte and Thomsen, Peter T. and Emanuelson, Ulf (2012). Herd-level risk factors associated with cow mortality in Swedish dairy herds. Journal of dairy science. 95:8, 4352-4362
[Journal article]

[img]
Preview
PDF
269kB

Official URL: http://dx.doi.org/10.3168/jds.2011-5085

Abstract

An increase in on-farm mortality (euthanasia and death) in dairy herds has been reported in several countries in the last decade. This does not only imply possible problems with animal welfare, but it also causes economic losses to the farmer. The objective of this study was to evaluate time trends in on-farm dairy cow mortality in Sweden and identify potential herd-level risk factors. Data was retrieved on all Swedish dairy herds enrolled in the milk recording scheme between 2002 and 2010. Herds with a herd size of < 20 cows or a mortality rate (MR) of > 40 dead or euthanized cows per 100 cow-years were excluded. Two different models were used: 1 multiple year analysis which included 6,898 herds during the period 2002 to 2010 and 1 single year analysis including 4,252 herds for the year 2010, where other variables that were not present during the entire multiple year study were analyzed. The outcome variable was the number of euthanized and dead cows per year and season. A negative binomial regression model, adjusted for clustering within herd, was applied to both models. Fixed effects in the multiple year analysis were breed, calving interval, herd size, milk yield, region, season, pasture period, and year. Fixed effects in the single year analysis were breed, calving interval, conventional vs. organic farming, herd size, housing system, milk yield, region, and season. The multiple year analysis demonstrated that MR gradually increased from 5.1 to 6.6 events per 100 cow-years during the study period. Swedish MR are consequently on par with, or even greater than, MR among dairy herds in other comparable countries. Higher mortality was associated with larger herd size, longer calving intervals, and herds that had Swedish Holstein as the predominant breed. Lower mortality was observed in herds with a higher herd average milk yield, during the fall and winter, and in organically managed herds. There were regional differences in mortality. An interaction between herd size and season was found in both models. Also, an interaction between housing system and milk yield was found in the single year analysis. This first assessment of on-farm mortality in Swedish dairy herds confirmed that the MR has increased over the last few years. The study also identified some herd-level risk factors.

Authors/Creators:Alvåsen, Karin and Jansson Mörk, Marie and Hallén Sandgren , Charlotte and Thomsen, Peter T. and Emanuelson, Ulf
Title:Herd-level risk factors associated with cow mortality in Swedish dairy herds
Series/Journal:Journal of dairy science (0022-0302)
Year of publishing :August 2012
Volume:95
Number:8
Page range:4352-4362
Publisher:American Dairy Science Association, Elsevier
ISSN:0022-0302
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:L Animal production > L73 Animal diseases
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Medical Bioscience
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Pathobiology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Clinical Science
Keywords:epidemiology, euthanasia, death
URN:NBN:urn:nbn:se:slu:epsilon-e-746
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-746
Additional ID:
Type of IDID
DOI10.3168/jds.2011-5085
ID Code:9170
Department:(VH) > Dept. of Clinical Sciences
External funders:Stiftelsen Lantbruksforskning
Deposited By: Karin Alvåsen
Deposited On:28 Nov 2012 15:03
Metadata Last Modified:02 Dec 2014 10:52
Project info:
Name:

Repository Staff Only: item control page