Improving genetic disease resistance in farm animals : a seminar in the Community Programme for the Coordination of Agricultural Research, held in Brussels, Belgium, 8-9 November 1988 / ed. by A.J. van der Zijpp and W. SybesmaStudiedagen genetische manipulatie bij landbouwhuisdieren, 17 januari 1989 = Symposium on genetic manipulation in farm animals / organisatiecommissie: H. A. M. van der steen, B. A. M. van der Zeijst [en] A. J. van der ZijppResearch strategy for animal production in Europe in the 21st century / A.J. van der Zijpp ... [et al.] (ed.)Foot and mouth disease : new values, innovative research agenda's and policies / A.J. van der Zijpp ... [et al.]Fishponds in farming systems / ed. by: A.J. van der Zijpp ... [et al.]White gold : opportunities for dairy sector development collaboration in East Africa / Nathaniel Makoni, Tsehay Redda, Jan van der Lee, Raphael Mwai, Akke van der Zijpp