The allometry of food intake in grazing ruminants.

Abstract

Due to the allometric relations of bite size and metabolic requirements to body size, small animals can subsist on shorter swards than larger animals. The density of nutrients in the grazed horizon of the modelled swards markedly affected the ability of animals of a given body size to satisfy their energy requirements. The allometric relationships would be expected to apply in selective grazing and browsing species in their choice of food items of different size and nutrient content. Simulation results support the argument that sexual segregation and habitat choice of dimorphic species is an effect of scramble competition for limited resources, the males thus being excluded from mutually preferred swards. The model provides an explanation for 2 interspecific phenomena amongst grazers: grazing succession and grazing facilitation.-from Authors Show more