• The Sampling Unit and Its Effect on Saltbush Yield Estimates

      Wight, J. R. (Society for Range Management, 1967-09-01)
      A 60- by 60-ft plot of Nuttall saltbush (Atriplex nuttallii) was completely harvested using 1- by 1-ft sampling units. Yield data for sampling units of various sizes and shapes were obtained by combining contiguous 1- by 1-ft plots. Sampling unit size and shape both had an important effect on sampling efficiency. The coefficient of variation decreased rapidly, as sampling unit size increased, until a sampling unit of about 60 ft2 was reached. For the smaller sampling units, the rectangular units generally had a lower coefficient of variation than those that were nearly square. Data are presented showing the relationship between sampling units of various sizes and shapes and (1) their coefficient of variation, (2) the number of samples needed to obtain a yield estimate that is within 20% of the population mean 90% of the time, and (3) the total area needed to be sampled to obtain this yield estimate.
    • Variation of Esophageal Fistula Samples Between Animals and Days on Tropical Grasslands

      Torell, D. T.; Bredon, R. M.; Marshall, B. (Society for Range Management, 1967-09-01)
      Forage collected by esophageal-fistulated cattle varies in chemical composition between days and animals. The number of samples needed for a given degree of accuracy was determined. Silica content of fistula steer feces was significantly different from feces from the non-fistulated steer. There were no significant differences in crude protein, crude fiber, and ether extract.
    • Water Requirements for Improved Livestock Performance on Rangeland

      Greenfield, S. F. (Society for Range Management, 1967-09-01)
      The close relationship between water intake and animal gains needs to be investigated for beef cattle under rangeland conditions. Water quality and distribution have nutritional implications and may contribute more to the desired level of livestock performance than commonly believed. If true, this would inspire and speed up the development of potential stockwater sources, enhance the benefit-cost ratio of economic considerations, and be useful to range management generally.
    • Weighing Forage Samples on Windy Ranges

      Bjerregaard, Richard S. (Society for Range Management, 1967-09-01)
    • What is Range Management?

      Stoddart, L. A. (Society for Range Management, 1967-09-01)