1. Agricultural Research Council (ARC).The Nutrient Requirements of Farm Livestock No. 2. Ruminants. Agricultural Research Council, London.
2. Allden, W. G. (1970). The effects of nutritional deprivation on the subsequent productivity of sheep and cattle.Nutrition Abstracts Review 40: 1167?1184.
3. Almagor, V. (1978).Pastoral Partners. Affinity and Bond Partnership among the Dassanetch of Southwest Ethiopia. Manchester University Press, Manchester.
4. Barry, R. G. (1969). Evaporation and transpiration. In Chorley, R. J. (ed.),Introduction to Physical Hydrology. Metheun, London.
5. Black, J. L., Graham, N., and Faichney, G. J. (1976). Simulation of protein and energy utilization in sheep. In Sutherland, T. M., McWilliam, J. R., and Leng, R. A. (eds.),Reviews in Rural Science II. Plant to Animal Protein, Armidale, pp. 161?166.