1. THE ROUTINE DETERMINATION OF IN VITRO DIGESTIBILITY OF ORGANIC MATTER IN FORAGES-AN INVESTIGATION OF THE PROBLEMS ASSOCIATED WITH CONTINUOUS LARGE-SCALE OPERATION
2. The effect of sward height and its direction of change on the herbage intake, diet selection and performance of weaned lambs grazing ryegrass swards
3. R.H. Armstrong, E. Robertson, C.S. Lamb, I.J. Cordon, and D. Elston(1993 ) Diet selection by lambs in ryegrass/clover swards differing in horizontal distribution of clover .Proceedings of the XVII International Grassland Congress. New Zealand, p.715 .
4. G.T. Barthram(1986 ) Experimental techniques: the HFRO sward stick .HFRO Biennial Report 1984-85. pp.29 -30 .
5. G.T. Barthram(1992 ) New equipment for determining the vertical distribution of herbage mass in pasture .Third Research Conference of the British Grassland Society. Antrim, Northern Ireland, pp.17 -18 .