Effect of Neospora caninum infection on milk production in first-lactation dairy cows

Mark Thurmond, Sharon K. Hietala

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Abstract

Objective - To determine whether cows seropositive to Neospora caninum produced less milk during their irst lactation than seronegative cows. Design - Repeated-measures, prospective study. Animals - 372 Holstein cows in their first lactation. Procedure - Cows were tested repeatedly before and during their first lactation for antibodies to N caninum. One-way and repeated-measures ANOVA were used to determine whether mean daily milk weights and milk weights from Dairy Herd Improvement Association testing were less for seropositive cows than for seronegative cows. Results - Weekly mean daily milk weights for the 118 seropositive cows were significantly less than those for the 254 seronegative cows, and milk production for seropositive cows (mean, 55.2 lb/cow/d) was 2.5 lb/cow/d less than that for seronegative cows (mean, 57.7 lb/cow/d). Analysis of results from Dairy Herd Improvement Association testing revealed that production of seropositive cows was less for milk (3.1 lb/cow/d), fat-corrected milk (3.6 lb/cow/d), and fat (0.14 lb/cow/d) than production of seronegative cows. Clinical Implications - The economic impact of N caninum infection in dairy cows can include reduced revenues from decreased milk production, which may warrant culling of young, seropositive replacement stock.

Original languageEnglish (US)
Pages (from-to)672-674
Number of pages3
JournalJournal of the American Veterinary Medical Association
Volume210
Issue number5
StatePublished - Mar 1 1997

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ASJC Scopus subject areas

  • veterinary(all)

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