1. C.D. Allison, and M.M. Kothmann(1979 ) Effect of level of stocking pressure on forage intake and diet quality of range cattleProceedings of the Western Section of the American Society of Animal Science, p.30 .
2. The determinants of herbage intake by grazing sheep: The interrelationship of factors influencing herbage intake and availability
3. G.W. Arnold, and M.L. Duozinski(1966 ) The behavioral response controlling the food intake of grazing sheep .Proceedings of the 10th International Grassland Congress, Helsinki, pp.367 -370 .
4. R.D. Baker, J. Hodgson, T.T. Treacher, and J.M. Rodriguez(1975 ) A research strategy towards the improvement of grazing management .Proceedings of the 3rd World Conference on Animal Production, Melbourne, pp.211 -216 .