Development and Validation of a Pruritic Index to Assess the Impact of Chorioptic Mange Infestation in Dairy Cows

Authors

  • Kathleen Day University of Guelph, Ontario, Canada N1G 2W1
  • Ken Leslie University of Guelph, Ontario, Canada N1G 2W1
  • Todd Duffield University of Guelph, Ontario, Canada N1G 2W1
  • Jocelyn Jansen Ontario Ministry of Agriculture, Food and Rural Affairs
  • William Sears University of Guelph, Ontario, Canada N1G 2W1
  • Ian Dohoo University of Prince Edward Island, Canada
  • Javier Sanchez University of Prince Edward Island, Canada

DOI:

https://doi.org/10.21423/aabppro20025082

Keywords:

Pruritic Index Score, Mange Lesion Score, Chorioptes mites, productivity, endectocide treatment

Abstract

Recent studies reported a significant negative association between presence of mange lesions and reduced milk production in early lactation. In addition, there was a significant positive production response to moxidectin therapy in the transition period. However, the biological reasons for these effects were not described. It is suspected that mange infestation results in intense pruritis and decreased dry matter intake. This experiment sought to develop and validate a semi-quantitative scoring system to categorize the degree of pruritis in mange-infested dairy cattle. In addition, the association between Pruritic Index Score, Mange Lesion Score, presence of Chorioptes mites, measures of productivity, and response to endectocide treatment in Ontario dairy cattle was examined.

Author Biography

Kathleen Day, University of Guelph, Ontario, Canada N1G 2W1

Student

Cover image of the 35th Conference Proceedings: Holstein cows standing in a row at a fence. A small group of cattle are bunched together in a pen. Yellow background.

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Published

2002-09-26

Issue

2002

Section

Posters

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