Improvement of Native Range through New Grass Introduction

Abstract

The stocking rates depicted by the graph represent a basis for conservative stocking rates over a period of years. In a year of high precipitation and consequently high forage yield, additional livestock numbers may be grazed during the summer and fall, or the grazing season may be extended to a greater length than usual. In event of drought, livestock numbers may be reduced by selling more th'an the usual number of livestock, culling more strictly, or shortening the grazing period and extending the winter feeding period. Until more is known about proper levels of utilization, the proposed graph may serve the purpose of adjusting stocking rates as deemed necessary. A regression equation Y = 27.17 + 78.48 X, where Y = estimated yield of forage in pounds per acre, and X inches of precipitation in May plus June, was developed. This equation may be used to estimate forage production as early as July 1 each year. Assuming that a mature beef cow (1,000 pounds) requires 660 pounds of forage (airdry basis) per month an estimate of carrying capacity is determined for the varying amounts of forage production estimated. The data presented may be of considerable value in forecasting r a n g e production and stocking rates within certain limits. In years of high precipitation, the forage production may be high and the carrying capacity may consequently be increased. In event of drought, livestock numbers may be decreased to cope with reduced production.