Environmental load of Cryptosporidium parvum oocysts from cattle manure in feedlots from the central and western Uited Sates

Edward R Atwill, Maria Das Gracas C Pereira, L. Herrera Alonso, Cyrus Elmi, William B. Epperson, Robert Smith, Walter Riggs, Linda V. Carpenter, David A. Dargatz, Bruce Hoar

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

The first step in assessing the risk of water contamination by Cryptosporidium parvum oocysts from feedlot cattle (Bos taurus) production systems is to quantify the number of C. parvum oocysts present in the fecal material deposited by feedlot cattle. Our primary objective for this project was to estimate the daily environmental load of C. parvum oocysts in fecal material deposited by feedlot cattle from across the central and western USA. Our secondary goal was to genotype isolates of C. parvum from feedlot cattle to help facilitate proper identification of mammalian sources of waterborne C. parvum. Based on 5274 fecal samples from 22 feedlots in seven states (California, Washington, Colorado, Oklahoma, Texas, Nebraska, and South Dakota), we estimated a point prevalence of C. parvum of 0.99 to 1.08% in fecal material from feedlot pens from a wide range of climates and a diverse range of feedlot management systems. On average, fresh fecal material from throughout feedlot systems (recent arrivals to nearing slaughter) contained about 1.3 to 3.6 oocysts/g feces, which roughly translates to about 2.8 × 104 to 1.4 × 105 oocysts/animal per day.

Original languageEnglish (US)
Pages (from-to)200-206
Number of pages7
JournalJournal of Environmental Quality
Volume35
Issue number1
DOIs
StatePublished - Jan 2006

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry

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    Atwill, E. R., Pereira, M. D. G. C., Herrera Alonso, L., Elmi, C., Epperson, W. B., Smith, R., Riggs, W., Carpenter, L. V., Dargatz, D. A., & Hoar, B. (2006). Environmental load of Cryptosporidium parvum oocysts from cattle manure in feedlots from the central and western Uited Sates. Journal of Environmental Quality, 35(1), 200-206. https://doi.org/10.2134/jeq2005.0099