Relationship between height at withers and body length of calves, measured from the tip of the nose to the caudal edge of the tuber ischii (pin bone) / C.C. Ketelaar-de Lauwere, A.C. Smits, J.V. van den BergVrije opname van perspulp silage door zeugen in groepshuisvesting = Voluntary intake of sugar beet pulp silage by sows in group housing / H.W.J. Houwers, J.V. van den Berg, J. Haaksma