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Santa Gertrudis cattle activities were dominated by grazing, standing and ruminating. Only minor differences occurred between winter and summer activities. Summer morning temperatures were negatively related to percentage of herd grazing, indicating a decrease in grazing as temperature increased. However, summer daytime vapor pressure deficit (VPD) showed a better correlation with grazing habits. As VPD increased the number of cattle grazing decreased; conversely, as VPD decreased cattle grazing increased. Cattle indicated a strong grazing preference for untreated vegetation, even though herbage production was substantially higher in the herbicide treated strips. The Rio Grande Plain resource area of Texas is utilized almost entirely as rangeland (Thomas 1975). Much of the rangeland has become infested with woody plants and is in need of some type of brush control for range improvement (TCNC 1970). Aerial application of herbicides has become a popular and efficient means of achieving woody plant reductions. Many large pastures in the Rio Grande Plain are herbicide treated in a strip pattern. This not only controls woody plant density and stature but also provides suitable habitat for white-tailed deer (Odocoileus virginianus Boddaert)' . Knowledge of cattle activities and preferences in herbicide treated pastures is important in assisting range managers to formulate sound decisions concerning proper utilization of rangeland following treatment. Cattle activities have been studied in the tall grass prairie by Weaver and Tomanek ( 195 1) and Dwyer (196 1) . Herbel and Nelson (1966) compared Santa Gertrudis and Hereford cattle activities on the Jornada Experimental Range in New Mexico. Gory (1927) studied the habits of cattle, sheep, and goats at the Sonora Experiment Station on the Edwards Plateau of Texas. Box et al. (1965) investigated the effects of supplemental feeding on cattle activities in the Texas high plains. Research was conducted from 1973 through 1975 in a patterned herbicide treated pasture to investigate (a) cattle activities, (b) cattle preferences for treated or untreated strips, Authors are graduate research assistant and professor, Department of Range Science, Texas A&M University, College Station. This article is published with the approval of the Director, Texas Agricultural Experiment Station as TA-14379. The authors would like to thank Mr. B.K. Johnson, owner, Chaparrosa Ranch, Zavala County, Texas, for allowing the study to be made, and the Caesar Kleberg Research Program in Wildlife Ecology at Texas A&M University for financial support. Manuscript received July 23, 1978. I Scientific and common mammal names follow Davis (1974). JOURNAL OF RANGE MANAGEMENT 32(6), November 1979 Fig. 1. Location of water stations in the Big Williams Pasture, Chaparrosa Ranch, Zuvala County, Texas. Parts of the pasture not included in an arc were more than I A km from water. Earthen tanks are indicated by T and wells with concrete troughs by W. and (c) relationships of grazing to selected environmental factors.

Cattle Activities and Preferences following Strip Application of Herbicide