SEMIARID WARM-SEASON GRASS YIELD AND NUTRITIVE-VALUE IN ARGENTINA

The use of standing dead biomass, during the winter that was produced by warm-season grasses in the previous growing season by pregnant beef cows may be an alternative to grazing systems in the semi-arid Pampea n Region of Argentina, This study, conducted over 2 years, 1990 and 19 91, compared the winter forage quality produced during the previous gr owing season for 4 warm-season grasses; switchgrass (Panicum virgatum L. cv. Pathfinder), kleingrass (Panicum coloratum L.), tetrachne (Tetr achne dregei Nees) and weeping lovegrass (Eragrostis curvula (Schrad), Nees cv. Tanganyka), Five harvests of the summer growth started after the first frost, and were spaced evenly throughout the winter period, Changes in the standing crop of dry matter were measured and subsampl es of forage were divided into leaf and stem fractions, Forage quality analyses included: crude protein (CP), in vitro dry matter digestibil ity (IVDMD), effective rumen degradability (ED), neutral (NDF) and aci d (ADF) detergent fiber and lignin, Tetrachne dregei produced forage w ith a higher leaf:stem ratio and of generally higher quality, than the other species, although the differences were not always significant, Its CP content was marginally below the maintenance requirements of co ws, Dry matter yield of tetrachne was lower than that of weeping loveg rass, but differences were only significant in 1990, Kleingrass genera lly was high in quality and dry matter yield, although it was the lowe st in percentage of leaves of the 4 species evaluated, Switchgrass was the least productive; the nutritive value of its forage was low, comp arable or lower than that of weeping lovegrass, The first harvest date was higher in nutritive value, Although the nutritive value of leaves and stems were not compared statistically, the leaves tended to be hi gher than the stems, Tetrachne dregei, the best of the species evaluat ed in this study, is a very promising warm-season grass, which could p rovide nutritious forage for winter grazing systems in the semiarid Pa mpean Region of Argentina.