Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 October 1956
Published in Agron J 48:440-444 (1956)
© 1956 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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The Distribution of Excreta by Freely Grazing Cattle and Its Effect on Pasture Fertility: I. Excretal Distribution1

R. G. Petersen, H. L. Lucas and W. W. Woodhouse, Jr.2

Synopsis: The negative binomial distribution function is used to characterize quantitatively the time-space distribution of excreta from freely-grazing animals over long periods of time; the Poisson distribution function was found to be reasonably accurate over short periods. Proportion of pasture covered by 0, 1, 2, . . . excretions during a grazing period appears to depend primarily on mean excretal density at the end of the period, and to be practically independent of the size and shape of the pasture.

1 Contribution from the Departments of Experimental Statistics and Agronomy, North Carolina Agr. Exp. Sta., Raleigh, N. C. Published with the approval of the Director as Paper No. 663 of the Journal Series. The results reported in this paper are part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree at North Carolina State College, Raleigh. Presented at the 1954 meetings of the American Society of Agronomy, St. Paul, Minn.

2 Formerly Assistant Statistician, Department of Experimental Statistics, North Carolina State College, now Station Statistician, Oregon Agr. Exp. Sta., Corvallis, Oreg.; Professor of Statistics, Department of Experimental Statistics; and Professor of Agronomy, Department of Agronomy, North Carolina State College, Raleigh. The authors wish to express their appreciation to the American Potash Institute for financial assistance during this investigation.

Received for publication February 13, 1956.


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S. L. White, R. E. Sheffield, S. P. Washburn, L. D. King, and J. T. Green Jr.
Spatial and Time Distribution of Dairy Cattle Excreta in an Intensive Pasture System
J. Environ. Qual., November 1, 2001; 30(6): 2180 - 2187.
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Copyright © 1956 by the American Society of Agronomy.