01757nam a2200313 a 450000100080000000500110000800800410001910000190006024500940007926000430017330000090021649000500022552009210027565000220119665000160121865000120123465000240124665000130127065000090128365000110129265000180130365000230132165000220134465000120136665000170137865000100139565300120140570000260141715694982009-10-26       2003    bl uuuu     u0uu1 u    #d1 aBARIONI, L. G.  aMétodo para estimar o tamponamento nutricional para vacas de corte em sistemas pastoris.  aPlanaltina, DF: Embrapa Cerradosc2003  a4 p.  a(Embrapa Cerrados. Comunicado Técnico, 100).  aPlanning forage needs in beef cattle enterprises is necessary for efficient utilization of genetic and environmental resources in pastoral systems and to generate economic benefits in an environmentally sound way. Production risk evaluation is essential in feed planning for cow-calf operations in pastoral systems. The proposed method to accomplish with production risk in these systems is based on the time biological system is maintained in an acceptable state under adverse climate conditions. This is coined "buffering time". The buffering time is calculated for both animals and pasture using an energetic approach. For cows, the buffering time is the minimum period the animal takes to reach the lowest acceptable body weight. for pasture, it is period for herbage mass to decrease to its mininum acceptable pasture buffering time indicated that increasing stocking rates put grazing systems at a higher risk.  aanimal production  abeef cattle  agrazing  amathematical models  aplanning  arisk  aBovino  aGado de Corte  aModelo Matemático  aNutrição Animal  aPastejo  aPlanejamento  aRisco  aBovinae1 aMARTHA JÚNIOR, G. B.