Objective: To determine whether time until culling or risk of culling was associated with Neospora caninum serostatus among Holstein cattle in dairy herds in Ontario.
Design: Retrospective cohort study.
Animals: 3,412 cows in 56 herds.
Procedure: Blood samples were collected, and serum was tested for antibodies against N. caninum. Information on cows that were culled was collected during the 1- to 2-year period that producers were unaware of serostatus of individual cows in their herds.
Results: Herd prevalence of N. caninum-seropositive cows ranged from 0 to 68.3% (median, 7.0%). During the time of the study, 184 of 359 (51.3%) N. caninum-seropositive cows were culled, compared with 1,388 of 3,053 (45.5%) seronegative cows. Mean time from blood sample collection to culling for seronegative cows (289 days; 95% confidence interval, 280 to 299 days) was not significantly different from mean time for seropositive cows (296 days; 95% confidence interval, 269 to 323 days). Survival analysis indicated that N. caninum serostatus was not associated with time to culling or risk of culling.
Conclusions And Clinical Relevance: Results suggest that N. caninum serostatus of Holstein cows in Ontario was not significantly associated with either time to culling or risk of culling. Thus, N. caninum serostatus alone should not be used to determine whether cows should be culled.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.2460/javma.2002.221.1165 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Dynamics of -Associated Abortions in a Dairy Sheep Flock and Results of a Test-and-Cull Control Programme.
Pathogens
November 2021
SALUVET Group, Animal Health Department, Faculty of Veterinary Sciences, Complutense University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain.
is an apicomplexan parasite that can cause abortions and perinatal mortality in sheep. Although ovine neosporosis has been described worldwide, there is a lack of information about the relationship between serostatus and the reproductive performance. In this study, we described the infection dynamics in a dairy sheep flock with an abortion rate up to 25% and a seroprevalence of 32%.
View Article and Find Full Text PDFSerological evidence of Coxiella burnetii, Leptospira interrogans Hardjo, Neospora caninum and bovine pestivirus infections in a dairy cattle herd from the United Arab Emirates.
Vet Ital
December 2020
Department of Data Analytics in the Digital Era, College of Business and Economics, United Arab Emirates University, P.O. Box 15551, Al Ain, United Arab Emirates.
The serostatus of five abortigenic agents and the association between abortion history and Coxiella burnetii seropositivity were assessed in 350 dairy cattle from Al Ain, UAE. The bovine sera were ELISA-screened for C. burnetii, Leptospira Hardjo, Neospora caninum, and Brucella abortus antibodies, plus bovine pestivirus (BVDV) antigen.
View Article and Find Full Text PDFControlling Endemic -Related Abortions in a Dairy Herd From Argentina.
Front Vet Sci
December 2019
Animal Production Department, National Institute of Agrarian de Technology, Balcarce, Argentina.
After diagnosis of endemic abortions due to neosporosis in a commercial dairy farm, routes of -transmission were evaluated in order to choose the best strategy for reducing its seroprevalence and related abortions. Fifty two dam-calf pairs were bled at parturition. Additionally, 22 female calves were also sampled at regular 3 month intervals until 18-22 months.
View Article and Find Full Text PDFThe serostatus of Brucella spp., Chlamydia abortus, Coxiella burnetii and Neospora caninum in cattle in three cantons in Bosnia and Herzegovina.
BMC Vet Res
February 2018
Norwegian University of Life Sciences, Faculty of Veterinary Medicine, P.O. Box 8146, 0033, Oslo, Norway.
Background: Dairy production in Bosnia and Herzegovina exhibits limited productivity, which may partly, be explained by extensive reproductive problems of non-infectious and infectious origin. Brucella spp., Chlamydia abortus, Coxiella burnetii and Neospora caninum are common infectious causes of decreased reproductive outcomes in cattle worldwide.
View Article and Find Full Text PDFInfection during the First Gestation of Holstein Heifers That Consume Food Contaminated Naturally with Zearalenone under Field Conditions.
Iran J Parasitol
January 2017
Faculty of Agricultural Sciences, Autonomous University of the State of Morelos, Cuernavaca, Morelos, México.
Background: This work studied the natural infection of during the first gestation of heifers in a dairy farm in animals consuming a ration co ntaminated naturally with Zearalenone (ZEA), and to find out effect of mycotoxin in the levels of estrogen (E) and progesterone (P4) and that's relation to the infection to and in the abortions.
Methods: The study was conducted in a dairy farm located in El Llano municipality, in Aguascalientes, Mexico, in 2013. Two groups were formed, the group "A" with 20 seronegative animals to , and group "B" with 20 seropositive.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!