Chromic oxide contamination of pasture previously used in marker studies
Author
Sprinkle, J. E.Kress, D. D.
Doornbos, D. E.
Anderson, D. C.
Tess, M. W.
Ansotegui, R. P.
Olson, B. E.
Roth, N. J.
Issue Date
1995-05-01Keywords
chromic oxidecontrolled release
contamination
experimental bias
errors
feces composition
pastures
beef cows
grazing
forage
Metadata
Show full item recordCitation
Sprinkle, J. E., Kress, D. D., Doornbos, D. E., Anderson, D. C., Tess, M. W., Ansotegui, R. P., ... & Roth, N. J. (1995). Chromic oxide contamination of pasture previously used in marker studies. Journal of Range Management, 48(3), 194-197.Publisher
Society for Range ManagementJournal
Journal of Range ManagementDOI
10.2307/4002419Additional Links
https://rangelands.org/Abstract
Fecal output of range cows was determined during 2 periods of summer (period I) and late summer (period II) grazing using a constant release intraruminal Cr2O3 bolus. Chromic oxide contamination was determined by analyzing forage for Cr2O3 and by obtaining fecal samples from cows prior to bolusing. Control cows were also monitored along with the experimental cows during grazing periods. The overall herd least squares mean for fecal output during period I was lower than the expected value by 48%. Forage during period I contained an average of 55.7 microgram Cr2O3 g-1 of forage or about 45% of the daily dose of the bolus. Forage during period II contained an average of 38.3 microgram Cr2O3 g-1 of forage or about 29% of the daily dose of the bolus. Our results indicate that comparisons of fecal output least squares means by period of the year can be biased by Cr2O3 contamination of forage in pastures which have been previously used for marker studies.Type
textArticle
Language
enISSN
0022-409Xae974a485f413a2113503eed53cd6c53
10.2307/4002419