Abstract
Because feed evaluation of new feeds for animal nutrition requires in vivo trials, which can be expensive, harmful to the animals and time consuming, alternatives have been developed. in vitro techniques are used commonly for many farm animal species. However, in vitro data do not always predict in vivo data satisfactorily. As many processes in the gastro intestinal tract of different animal species are comparable also the digestibility of feeds may be comparable. The aim of this research was to identify similarities in digestibility coefficients between different farm animal species. If it is possible to use in vivo data of one animal species for the evaluation of alternative techniques for another species, this would enlarge existing data sets, accelerate the validation of new techniques and reduce the number of harmful animal trials.
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