Some abstracts do not have video files because ASAS was denied recording rights.

1234
Investigating the within-herd prevalence and risk factors of hyperketonemia of dairy cattle in Ontario as diagnosed by the test-day concentration of milk ß-hydroxybutyrate

Friday, July 22, 2016: 3:45 PM
151 E/F (Salt Palace Convention Center)
Elise H Tatone , Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
Todd F Duffield , Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
Stephen J LeBlanc , Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
Trevor J. DeVries , Department of Animal Biosciences, University of Guelph, Guelph, ON, Canada
Jessica L. Gordon , Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
Audio File Recorded Presentation (mp4)
Abstract Text:

A large-scale observational study was conducted to estimate the within-herd prevalence and cow-level risk factors of hyperketonemia (HK) in dairy herds in Ontario that participate in a dairy herd improvement association (DHIA) program. Hyperketonemia was diagnosed as milk ß-hydroxybutyrate ≥ 0.15 mmol/L (Ketoscreen test, MilkoScan FT600, Foss Analytical A/S, Hillerød, Denmark) at first DHIA test within the first 30 days in milk (DIM). Eight hundred and thirteen herds providing at least 61 first milk tests from June 2014 to December 2015 and were used to estimate the provincial within-herd prevalence with 95% confidence, 80% power and precision of 10%. All herds on DHIA in Ontario (n= 3042) were used to construct multi-level logistic regression models to investigate the association of commonly measured variables with the odds of HK at first DHIA milk test at the cow-level. The overall HK prevalence in Ontario was 22% of cows at first test, with an average within-herd prevalence of 21% (SD = 10.6). The prevalence of HK had a distinct seasonality with the lowest prevalence occurring from July to November. Herds with automatic milking systems (AMS) (11%, n=92) had higher within-herd prevalence than all other herds, as well as increased odds of HK in multiparous animals at first test (OR: 1.46; CI95: 1.30 to 1.63). This association requires further study of causal factors. Both primiparous and multiparous Jersey cattle had 1.4 times higher odds of HK than Holstein cattle. After controlling for breed, a milk yield > 26 kg and milk fat > 4.8% at the last milk test of the previous lactation were associated with decreased odds of HK in the current lactation (ORyield: 0.55; ORfat%: 0.83). Increased days dry and longer calving intervals, for multiparous animals, and older age at first calving for primiparous animals increased the odds of hyperketonemia at first test. This is the first report of associations of AMS, and milk yield and components late in the previous lactation with increased HK. 

Keywords:

prevalence hyperketonemia beta-hydroxybutyrate

See more of: Production, management and the environment: Health and welfare
See more of: Production, Management, and the Environment
<< Previous Abstract | Next Abstract >>

American Society of Animal Science, PO Box 7410, Champaign, IL 61826-7410 E-mail: asas@asas.org, Ph. 217.356.9050, Fax 217.689.2436 All pages Copyright © 2012 ASAS. All Rights Reserved.