Relationship between herd size and annual prevalence of and primary antimicrobial treatments for common diseases on dairy operations in the United States

Ashley E Hill, Alice L. Green, Bruce A. Wagner, David A. Dargatz

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Dairy operations in states representing 86% of the United States' national dairy herd were surveyed regarding the occurrence of common dairy diseases or disorders (digestive, respiratory, gastrointestinal, lameness, mastitis, navel infection) in specified production groups (weaned heifers, unweaned heifers, adult cows), and the most common antimicrobial preparation used to treat these conditions. Within disease and production group, disease frequency and characteristics of primary antimicrobial (drug class, availability, spectrum of activity, extra-label usage, withdrawal times) were compared among herd sizes (30-99, 100-499, and ≥500 cows) using chi-square or t-tests that accounted for the sampling design. The most common diseases were mastitis and lameness in cows, and gastrointestinal disease in unweaned calves, affecting 16, 11, and 15% of the target populations, respectively. Herd-level disease prevalence tended to increase as herd size increased, whereas within-herd prevalence tended to decrease as herd size increased. Broad-spectrum antimicrobials were selected as primary treatments by a majority of operations for nearly all diseases surveyed. When treating gastrointestinal disease, navel infection, or reproductive disorders, a majority of operations selected primary treatments not specifically labeled for that condition. Selection of over-the-counter preparations tended to decrease as herd size increased, whereas selection of broad-spectrum preparations tended to increase with herd size.

Original languageEnglish (US)
Pages (from-to)264-277
Number of pages14
JournalPreventive Veterinary Medicine
Volume88
Issue number4
DOIs
StatePublished - Apr 1 2009
Externally publishedYes

Fingerprint

herd size
dairies
digestive system diseases
anti-infective agents
cows
Mastitis
lameness
Gastrointestinal Diseases
mastitis
heifers
herds
reproductive disorders
disease prevalence
dairy herds
infection
Health Services Needs and Demand
Infection
calves
drugs
Pharmaceutical Preparations

Keywords

  • Antimicrobial use
  • Cattle-morbidity
  • Cross-sectional studies
  • Dairy
  • National Animal Health Monitoring System (NAHMS)
  • Prevalence

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Food Animals

Cite this

Relationship between herd size and annual prevalence of and primary antimicrobial treatments for common diseases on dairy operations in the United States. / Hill, Ashley E; Green, Alice L.; Wagner, Bruce A.; Dargatz, David A.

In: Preventive Veterinary Medicine, Vol. 88, No. 4, 01.04.2009, p. 264-277.

Research output: Contribution to journalArticle

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