Technical Bulletin no. 686
Intermountain Forest and Range Experiment Station
U.S. Department of Agriculture
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Fundamental in economical range-resource management is the determination of proper grazing periods. It is of prime importance to be able to establish a date in the spring when the range has produced sufficient feed to keep livestock in thrifty condition, when it is reasonably safe from excessive trampling and packing of the soil, and when the more important key forage plants have attained sufficient development to withstand grazing use. Such opening dates, as well as the time to defer and rotate grazing and to remove livestock from the range, are dependent in part on the prevailing weather conditions and on the dates when active growth of the forage plants begins and when subsequent developmental stages of the plants are reached.
Costello, David F.; Price, Raymond. 1939. Weather and plant-development data as determinants of grazing periods on mountain range. Technical Bulletin No. 686. Washington, DC: U. S. Department of Agriculture, U. S. Government Printing Office. 31 p.