02431nam a2200349 a 450000100080000000500110000800800410001910000210006024501130008126000420019430000090023650000200024552015380026565000090180365000160181265000230182865000100185165000110186165000100187265000090188265000130189165000210190465000220192565300110194765300190195865300200197765300200199765300230201765300120204065300210205265300080207315566791997-02-04       1985    bl uuuu  m   00u1 u    #d1 aMORAES, E. A. de  aCattle diets from yearlong and rotational grazing at two stocking densities on the Texas Experimental Ranch.  a[Texas]: Texas A & M Universityc1985  a84p.  aTese Doutorado.  aFlve paddocks of a heavily stocked (3.3 AUM/ha) rotatlonal grazing (RG) system at two stocking densitles, two paddocks simulated 14 (RG-14) and three paddocks simulated 42 (RG-42) paddocks per herd, and a moderately stocked (2.02 AUM/ha) continuously grazed (MC) paddock were studied at the Texas Experimental Ranch to evaluate their effects on diet selection. The dietary percentages were determined for major plant specles, classes, and plant parts. In vitro digestibility of organic matter (IVOMD), crude protein (CP), and organic matter (OM) were also determined. Precipitation was 14% below the 22-year average and irregularly distributed through the 2-year period from 1982 to 1984. Texas wintergrass (Stipa leucotricha Trin. Rupr.), sideoats grama (Boutelouacurtipendula Michx. Torr.), and other warm-season grasses were the major dietary components. The percentage of cool-season grass and warm-season grass did not differ significantly (P&lt0.05) under RG and MC, but there were more forbs in diets from MC than RG, during last five trials. Cows on RG selected silghtly more sideoats grama than on MC. Grasses accounted for 92% of diets in both RG-14 and RG-42, and 89% in MC. Cattle on RG shifted from cool-season grasses to warm-season grasses earller in the spring than those on MC. The variation in diet selection between paddocks within stocking densitlys on RG was greater than the difference between stocking densitles. Seasonal variation was the ,major factor affecting botanical and chemical composition of diet....  adiet  aovergrazing  arotational grazing  aTexas  aBovino  aDieta  aGado  aPastagem  aPastejo Continuo  aTaxa de Lotação  aCottle  aEstados Unidos  aFeeding systems  aGrazing systems  aPastejo rotacional  aSistema  aStocking density  aUSA