McLean, Barbara M L; Frost, David and Evans, D Eifion (2002) The use of feed blocks as supplementation for theupland hill flock: (1) Improving organic ewe productivity and performance. UK Organic Research 2002 Conference, Aberystwyth, 26-28 March 2002. In: Powell, Jane and et al., (Eds.) Proceedings of the UK Organic Research 2002 Conference, Organic Centre Wales, Institute of Rural Studies, University of Wales Aberystwyth, pp. 277-278.