01838nam a2200169 a 450000100080000000500110000800800410001910000130006024501500007326000890022352012700031265000130158265300230159570000160161870000160163470000180165010522522017-07-26       2002    bl uuuu     u01u1 u    #d1 aSOCA, P.  aEffect of pasture height and control of grazing time on grazing behaviour and defoliation dynamics of growing beef cattle.h[electronic resource]  aIn:  Symposium Responding to the increasing global demand for animal products.c2002  aThe forage intake in grazing animals has been defined as the product of the bite size and biting rate integrated within the grazing time. Pasture height and density are the most important factors explaining bite size (Laca and Demment, 1996), while the internal state of the animal, quantity and quality of the available pasture, final products of digestion and photoperiod have been postulated as the main factors that affect the length of the grazing session (Soca, 2000). Pasture height and available time for grazing interact with pasture allowance and chemical composition of the supplement, affecting pasture intake rate, selectivity, energetic costs of harvesting the pasture and the nutritional balance of the animals (Soca, 2000). Experiments, conducted on daily management of a herd of dairy cows, imposed different times of access to grazing suggest that the control of the grazing time could improve the efficiency of pasture utilization (Soca et al, 1999). This experiment was carried out to evaluate the effect of the control of grazing time and pasture height on grazing behaviour and the dynamics of defoliation, resulting from growing cattle grazing an improved pasture at the same forage allowance and supplemented with an energy-rich concentrate.  aPASTOREO  aPASTOREO POR HORAS1 aBERETTA, V.1 aHEINZEN, M.1 aBENTANCUR, O.