Monitoring Subclinical Ketosis Using Milk Strip Test and Control Chart in Dairy Herds

Authors

  • Luc DesCôteaux Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, Québec, Canada J2S 7C6
  • Todd Duffield Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1
  • Anne-Marie Bélanger Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, Québec, Canada J2S 7C6
  • Émile Bouchard Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, Québec, Canada J2S 7C6
  • Marcel Brodeur Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, Québec, Canada J2S 7C6
  • Cécile Ferrouillet Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, Québec, Canada J2S 7C6
  • Randal Bagg Elanco Animal Health, Division Eli Lilly Canada Inc., 150 Research Lane, Suite 120, Guelph, Ontario N1G 4T2
  • Jean Baril Elanco Animal Health, Division Eli Lilly Canada Inc., 150 Research Lane, Suite 120, Guelph, Ontario N1G 4T2

DOI:

https://doi.org/10.21423/aabppro20035311

Keywords:

Subclinical ketosis, serum betahydroxybutyrate, metabolic disorders, cow-side test, Statistical Process Control, Control Charts, Keto-Test

Abstract

Subclinical ketosis (SCK), based on a serum betahydroxybutyrate (BHB) concentration ≥1400 μmol/L (14.4 mg/dL), is a metabolic disease that has been associated with reduced milk production and increased risk of other metabolic disorders. Duffield et al (2001) have reported a median prevalence of SCK of 41% among 25 dairy herds, and a within-herd prevalence ranging between 8 and 80%. A milk strip cow-side test (Keto-Test, Elanco Animal Health, Guelph, Ontario) has been shown to have a sensitivity of 91% and a specificity of 74% to detect SCK in dairy cows when using a cut-off value of 100 μmol/L of BHB (Osborne et al, 2002). Statistical Process Control (SPC) and the use of Control Charts are tools that can be used in order to monitor health status in production medicine programs. Our objectives are to provide an overview of the SPC and Control Charts and to present a practical application of this tool using milk Keto-Test to monitor SCK in dairy herds.

Cover image of the 36th Conference Proceedings: Holstein cows standing in a row at a fence. One cow has put her head through the fence and is curiously inspecting a pile of hay. Yellow background.

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Published

2003-09-18

Issue

2003

Section

Research Summaries - Dairy II

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