Epidemiology of subclinical ketosis in early lactation dairy cattle

The purpose of this study was to describe the epidemiology of subclinical ketosis (SCK) in dairy cows in early lactation and determine the association of (1) days in milk (DIM) at onset of SCK, and (2) blood β-hydroxybutyrate (BHBA) concentration at onset of SCK with development of displaced abomasu...

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Bibliographic Details
Published in:Journal of dairy science 2012-09, Vol.95 (9), p.5056-5066
Main Authors: McArt, J.A.A., Nydam, D.V., Oetzel, G.R.
Format: Article
Language:English
Subjects:
3-hydroxybutyric acid
3-Hydroxybutyric Acid - blood
analysis of variance
Animal productions
Animals
Biological and medical sciences
blood
Cattle
Cattle Diseases - epidemiology
Cattle Diseases - metabolism
Cattle Diseases - physiopathology
conception
confidence interval
dairy cow
dairy cows
dairy herds
displaced abomasum
early lactation
epidemiology
Female
Food industries
free stalls
Fundamental and applied biological sciences. Psychology
incidence
ketosis
Ketosis - epidemiology
Ketosis - veterinary
Lactation - metabolism
Lactation - physiology
milk
Milk and cheese industries. Ice creams
milk yield
Pregnancy
prevalence
risk
Terrestrial animal productions
Vertebrates
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Summary:The purpose of this study was to describe the epidemiology of subclinical ketosis (SCK) in dairy cows in early lactation and determine the association of (1) days in milk (DIM) at onset of SCK, and (2) blood β-hydroxybutyrate (BHBA) concentration at onset of SCK with development of displaced abomasum (DA) and removal from herd in the first 30 DIM, conception to first service, days to conception within 150 DIM, and early lactation milk yield. Cows from 4 freestall dairy herds (2 in New York and 2 in Wisconsin) were each tested 6 times for SCK from 3 to 16 DIM using the Precision Xtra meter (Abbott Laboratories, Abbott Park, IL). Subclinical ketosis was defined as a BHBA concentration of 1.2 to 2.9mmol/L. Mixed-effects multivariable Poisson regression was used to assess DA, removal from herd, and conception to first service. Semiparametric proportional hazards models were used to evaluate days to conception, and repeated-measures ANOVA was used to evaluate milk yield in the first 30 DIM. A total of 741 of 1,717 (43.2%) eligible cows had a least one BHBA test of 1.2 to 2.9mmol/L. Peak incidence of SCK occurred at 5 DIM, when 22.3% of cows had their first SCK-positive test. Peak prevalence of SCK occurred at 5 DIM, when 28.9% of cows had a SCK-positive test. Median time from first positive SCK test until BHBA test
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.2012-5443