Authors:
W. Ouweltjes Wageningen UR, Livestock Research, P.O. Box 65, 8200 AB Lelystad, the Netherlands; wijbrand.ouweltjes@wur.nl

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and
P. Galama Wageningen UR, Livestock Research, P.O. Box 65, 8200 AB Lelystad, the Netherlands; wijbrand.ouweltjes@wur.nl

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