Co-Authors:
Ungar, E.D., Dept Natural Resources, Agric Res Organization, The Volcani Center, POB 6, Bet Daga 50250, Israel
Seligman, N.G., Dept Natural Resources, Agric Res Organization, The Volcani Center, POB 6, Bet Daga 50250, Israel
Demment, M.W., Dept Natural Resources, Agric Res Organization, The Volcani Center, POB 6, Bet Daga 50250, Israel
Abstract:
Grazing by domesticated herbivores is discussed as a process of depletion in which the removal of herbage may be associated with a change in intake rate over a defined time period by virtue of changing options for bite selection. A model of depletion is presented in which a non-growing, non-patchy sward of finite area is described as a series of grazing horizons. Each horizon provides a number of potential bites equal to the ratio between horizon area and the bite area characteristic of the horizon. Bite weight is constant within horizon but may differ between horizons. Where depletion influences instantaneous intake rate, a model that describes the sward as a set of characteristic bites differentiated into horizons is more appropriate with greater emphasis on sward biomass. A bite-oriented approach with greater emphasis on sward structure may be necessary to understand the considerable variation in functional response to herbage allowance obtained in studies of high depletion systems. -from Authors
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