1. Aitken, J. R., W. G. Hunsaker, and G. S. Lindbald, 1962. Feeding geese on pasture. Proc. 11th World's Poult. Congr., Mexico City: 138–144.
2. Effect of alfalfa saponin on the performance of chicks and laying hens;Anderson;Poultry Sci.,1957
3. Sites of organic acid production and pattern of digesta movement in the gastrointestinal tract of geese;Clemens;J. Nutr.,1975
4. Cooper, M. McG., and D. W. Morris, 1973. Grass Farming. Farming Press, Ipswich, MA.
5. Properties of lucerne and other saponins;Coulson;Biochem. J.,1957