Association of herd composition, stocking rate, and duration of calving season with fecal shedding of Cryptosporidium parvum oocysts in beef herds

Edward R Atwill, Eileen M. Johnson, Maria Das Graças C Pereira

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Objective - To evaluate the association of herd demographics, parturition variables, stocking rate, and rotational grazing practices with the probability of fecal shedding of Cryptosporidium parvum from beef cow-calf herds in California. Design - Cross-sectional study. Sample Population - 38 beef cow-calf operations. Procedure - Fecal specimens were collected and examined for C parvum oocysts, using immunofluorescent microscopy. Association between various demographic and management factors and the probability of shedding C parvum were statistically evaluated. Results - Adjusted for age and month of collection of a fecal sample, cattle from herds with a high number of young calves (≤ 2 months old) on the day of sample collection, a high stocking rate (No. of cattle/ acre/mo), or a longer calving season were more likely to shed C parvum oocysts, compared with cattle from herds with fewer young calves, a lower stocking rate, or a shorter calving season. Cattle from herds with a higher number of older calves (> 2 months old) on the day of sample collection were less likely to shed C parvum oocysts, compared with cattle from herds with fewer older calves. Using our multivariate model, rotational grazing systems or season of onset of calving were not associated with shedding status for C parvum oocysts. Conclusions and Clinical Relevance - Reproductive management that would result in a shorter calving season and use of a lower stocking rate for cattle may be associated with reduced risk of C parvum shedding. Intensive rotational grazing systems and time of year for onset of calving season apparently have little effect on reducing prevalence of oocyst shedding.

Original languageEnglish (US)
Pages (from-to)1833-1838
Number of pages6
JournalJournal of the American Veterinary Medical Association
Volume215
Issue number12
StatePublished - Dec 15 1999

Fingerprint

Cryptosporidium parvum
Oocysts
oocysts
stocking rate
calving
beef
herds
rotational grazing
duration
calves
cattle
beef cows
demographic statistics
Demography
grazing
cow-calf operations
sampling
cross-sectional studies
Red Meat
Microscopy

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Association of herd composition, stocking rate, and duration of calving season with fecal shedding of Cryptosporidium parvum oocysts in beef herds. / Atwill, Edward R; Johnson, Eileen M.; Pereira, Maria Das Graças C.

In: Journal of the American Veterinary Medical Association, Vol. 215, No. 12, 15.12.1999, p. 1833-1838.

Research output: Contribution to journalArticle

@article{72e9474d082642609c52bde0abf6fb2b,
title = "Association of herd composition, stocking rate, and duration of calving season with fecal shedding of Cryptosporidium parvum oocysts in beef herds",
abstract = "Objective - To evaluate the association of herd demographics, parturition variables, stocking rate, and rotational grazing practices with the probability of fecal shedding of Cryptosporidium parvum from beef cow-calf herds in California. Design - Cross-sectional study. Sample Population - 38 beef cow-calf operations. Procedure - Fecal specimens were collected and examined for C parvum oocysts, using immunofluorescent microscopy. Association between various demographic and management factors and the probability of shedding C parvum were statistically evaluated. Results - Adjusted for age and month of collection of a fecal sample, cattle from herds with a high number of young calves (≤ 2 months old) on the day of sample collection, a high stocking rate (No. of cattle/ acre/mo), or a longer calving season were more likely to shed C parvum oocysts, compared with cattle from herds with fewer young calves, a lower stocking rate, or a shorter calving season. Cattle from herds with a higher number of older calves (> 2 months old) on the day of sample collection were less likely to shed C parvum oocysts, compared with cattle from herds with fewer older calves. Using our multivariate model, rotational grazing systems or season of onset of calving were not associated with shedding status for C parvum oocysts. Conclusions and Clinical Relevance - Reproductive management that would result in a shorter calving season and use of a lower stocking rate for cattle may be associated with reduced risk of C parvum shedding. Intensive rotational grazing systems and time of year for onset of calving season apparently have little effect on reducing prevalence of oocyst shedding.",
author = "Atwill, {Edward R} and Johnson, {Eileen M.} and Pereira, {Maria Das Gra{\cc}as C}",
year = "1999",
month = "12",
day = "15",
language = "English (US)",
volume = "215",
pages = "1833--1838",
journal = "Journal of the American Veterinary Medical Association",
issn = "0003-1488",
publisher = "American Veterinary Medical Association",
number = "12",

}

TY - JOUR

T1 - Association of herd composition, stocking rate, and duration of calving season with fecal shedding of Cryptosporidium parvum oocysts in beef herds

AU - Atwill, Edward R

AU - Johnson, Eileen M.

AU - Pereira, Maria Das Graças C

PY - 1999/12/15

Y1 - 1999/12/15

N2 - Objective - To evaluate the association of herd demographics, parturition variables, stocking rate, and rotational grazing practices with the probability of fecal shedding of Cryptosporidium parvum from beef cow-calf herds in California. Design - Cross-sectional study. Sample Population - 38 beef cow-calf operations. Procedure - Fecal specimens were collected and examined for C parvum oocysts, using immunofluorescent microscopy. Association between various demographic and management factors and the probability of shedding C parvum were statistically evaluated. Results - Adjusted for age and month of collection of a fecal sample, cattle from herds with a high number of young calves (≤ 2 months old) on the day of sample collection, a high stocking rate (No. of cattle/ acre/mo), or a longer calving season were more likely to shed C parvum oocysts, compared with cattle from herds with fewer young calves, a lower stocking rate, or a shorter calving season. Cattle from herds with a higher number of older calves (> 2 months old) on the day of sample collection were less likely to shed C parvum oocysts, compared with cattle from herds with fewer older calves. Using our multivariate model, rotational grazing systems or season of onset of calving were not associated with shedding status for C parvum oocysts. Conclusions and Clinical Relevance - Reproductive management that would result in a shorter calving season and use of a lower stocking rate for cattle may be associated with reduced risk of C parvum shedding. Intensive rotational grazing systems and time of year for onset of calving season apparently have little effect on reducing prevalence of oocyst shedding.

AB - Objective - To evaluate the association of herd demographics, parturition variables, stocking rate, and rotational grazing practices with the probability of fecal shedding of Cryptosporidium parvum from beef cow-calf herds in California. Design - Cross-sectional study. Sample Population - 38 beef cow-calf operations. Procedure - Fecal specimens were collected and examined for C parvum oocysts, using immunofluorescent microscopy. Association between various demographic and management factors and the probability of shedding C parvum were statistically evaluated. Results - Adjusted for age and month of collection of a fecal sample, cattle from herds with a high number of young calves (≤ 2 months old) on the day of sample collection, a high stocking rate (No. of cattle/ acre/mo), or a longer calving season were more likely to shed C parvum oocysts, compared with cattle from herds with fewer young calves, a lower stocking rate, or a shorter calving season. Cattle from herds with a higher number of older calves (> 2 months old) on the day of sample collection were less likely to shed C parvum oocysts, compared with cattle from herds with fewer older calves. Using our multivariate model, rotational grazing systems or season of onset of calving were not associated with shedding status for C parvum oocysts. Conclusions and Clinical Relevance - Reproductive management that would result in a shorter calving season and use of a lower stocking rate for cattle may be associated with reduced risk of C parvum shedding. Intensive rotational grazing systems and time of year for onset of calving season apparently have little effect on reducing prevalence of oocyst shedding.

UR - http://www.scopus.com/inward/record.url?scp=0033572052&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033572052&partnerID=8YFLogxK

M3 - Article

C2 - 10613218

AN - SCOPUS:0033572052

VL - 215

SP - 1833

EP - 1838

JO - Journal of the American Veterinary Medical Association

JF - Journal of the American Veterinary Medical Association

SN - 0003-1488

IS - 12

ER -