Authors:
Paul Koene Wageningen University & Research, Animal Welfare, Wageningen Livestock Research, the Netherlands; paul.koene@wur.nl

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Pieter Hogewerf Wageningen University & Research, Animal Welfare, Wageningen Livestock Research, the Netherlands; paul.koene@wur.nl

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Bert Ipema Wageningen University & Research, Animal Welfare, Wageningen Livestock Research, the Netherlands; paul.koene@wur.nl

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