1. ARMSTRONG R.H. ROBERTSON E. LAMB C.S. GORDON I.J. ELSTON D.A. 1993 Diet selection by lambs in ryegrass-white clover swards differing in the distribution of clover Proceedings of XVII International Grassland Congress, Hamilton, New Zealand, 1993
2. The effect of sward height and its direction of change on herbage intake, diet selection and performance on weaned lambs grazing ryegrass swards;ARMSTRONG;Grass and Forage Science,1995
3. AROSTEGUY J.C. 1982 The dynamics of herbage growth and utilization in sward grazed by cattle and sheep
4. BIRCHAM J.S. 1981 Herbage growth and utilization under continuous stocking management
5. Factors affecting diet selection by sheep. II. Height and density of pasture;BLACK;Australian Journal of Agricultural Research,1984