. Wildlife and range research needs in northern Mexico and southwestern United States : workshop proceedings, April 20-24, 1981, Rio Rico, Arizona. Wildlife management Southwestern States Congresses; Wildlife management Mexico Congresses. Figure 3.—Fenceline contrast showing differences in forage conditions as a result of grazing practices. The pasture on the left is grazed yearlong; the other is part of the Santa Rita Grazing System. RESPONSES OF YEARLING CATTLE AND LEHMANN LOVEGRASS TO GRAZING (Richard W. Rice, University of Arizona) The principal objectives of this cooperative study on the
. Wildlife and range research needs in northern Mexico and southwestern United States : workshop proceedings, April 20-24, 1981, Rio Rico, Arizona. Wildlife management Southwestern States Congresses; Wildlife management Mexico Congresses. Figure 3.—Fenceline contrast showing differences in forage conditions as a result of grazing practices. The pasture on the left is grazed yearlong; the other is part of the Santa Rita Grazing System. RESPONSES OF YEARLING CATTLE AND LEHMANN LOVEGRASS TO GRAZING (Richard W. Rice, University of Arizona) The principal objectives of this cooperative study on the ecology of Lehmann lovegrass (Eragrostis lehmanniana) are to: (1) determine the nutritive value and utilization of Lehmann lovegrass as affected by season and phenological stage of development, (2) determine the intake and utilization of Lehmann lovegrass by cattle grazing a relatively pure stand, (3) develop and test grazing strategies designed to provide maximum forage for grazing cattle while still maintaining productivity, (4) assess the response of Lehmann lovegrass to grazing intensity and season of use, and (5) design optimal grazing strategies for the integrated use of Lehmann. Figure 2.—Periods of forage growth and forage use for one pasture in the 3-pasture Santa Rita Grazing System. Similar sequences of forage growth and use for the second and third pastures begin November 1 of years two and three, respectively (Martin 1978). Lehmann lovegrass (fig. 4) now grows on large acreages of southwestern rangelands. This cool-season, introduced grass is very productive. Once established it often becomes the dominant vegetation, and may spread rapidly. Because cattle are reluctant to eat Lehmann lovegrass, special grazing management systems must be developed to utilize its production potential. Lehmann lovegrass is most nutritious and acceptable to cattle during the vegetative part of the growing season. It initiates growth during winter and spring, and uses moisture not e
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