Browsing Journal of Range Management, Volume 44, Number 5 (September 1991) by Authors
Forage yield and white-tailed deer diets following live oak controlFulbright, T. E.; Garza, A. (Society for Range Management, 1991-09-01)Live oak (Quercus virginiana Mill.) competes with herbaceous plants, but provides browse and mast for white-tailed deer (Odocoileus virginianus Zimmerman). We determined the effects of treating live oak with tebuthiuron on yield of herbaceous vegetation and white-tailed deer diets and nutritional indices. In 1982, 259 ha were aerially treated with 2.2 kg/ha active ingredient of tebuthiuron pellets in parallel, alternating treated and untreated strips, each measuring 76 m wide. A second area was treated in 1984. We clipped herbage during June and November 1985-86 within exclosures in treated and untreated strips, and determined chemical and botanical composition of rumen contents and kidney fat index (KFI) from deer killed in the 1982 strip treatment area and a control (untreated) area. Grass yield was 2-4 times higher on treated thin on untreated range. Forb yield was almost 5 times greater on range treated in 1982 than on untreated range, but yield on untreated range and areas treated in 1984 was similar. Deer sampled in the control ares had consumed more forbs than those sampled in the herbicide-stripped area except in fall 1985. The KFI was greater for deer sampled in the control area in fall 1985 and greater for those sampled in the stripped area in fall 1986. Treatment with tebuthiuron in alternating strips increased forage yield for cattle and was apparently not detrimental to KFI of deer.
Technical Note: Mineral content of guajillo regrowth following roller choppingFulbright, T. E.; Reynolds, J. P.; Beasom, S. L.; Demarais, S. (Society for Range Management, 1991-09-01)Guajillo (Acacia berlandieri Benth.) is browsed by white-tailed deer (Odocoileus virginianus Raf.). We determined phosphorus (P), potassium, (K), calcium (Ca), and magnesium (Mg) of browse from roller-chopped (July 1986 and July 1987) and nontreated guajillo. Browse from regrowth was temporarily higher in P than browse from nontreated plants. Potassium was higher in leaves from plants roller chopped in 1987. Calcium and Mg tended to be lower in leaves from roller-chopped plants. Roller chopping temporarily increases P and K, but whether or not browse from roller-chopped guajillo meets P and K requirements for deer is unknown.