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Published online by Cambridge University Press: 27 February 2018
Dietary choices of herbivores on rangeland complex vegetation are not easy to assess and give more or less biased results despite dedicated work (Holecheck et al., 1982; McInnis et al., 1983). Direct methods, such as oesophageal fistulas and direct observations can only be used in a limited range of conditions. Their negative effect on animal welfare emphasizes the need for non-injurious and nonstressful methods.