References

1. Van Soest, P.J. Nutritional Ecology of the Ruminant, 2nd Ed.; Cornell University Press: Ithaca, NY, 1994.

2. Mochi, U.; Carter, T.D. Hoofed Mammals of the World; Charles Scribner's Sons: NY, 1971.

3. Gentry, A.W.; Hooker, J.J. The Phylogeny of the Artio dactyla. In The Phylogeny and Classification of the Tetrapods Volume 2: Mammals; Benton, M.J., Ed.;

Systematics Association Special, Clarendon Press: Oxford, 1988; Vol. 35B, 235 272.

4. Hofmann, R.R. Evolutionary steps of ecophysiological adap tation and diversification of ruminants: A comparative view of their digestive system. Oecologia 1989, 78,443 457.

5. Hume, I.D.; Warner, A.C.I. The Evolution of Fermentative Digestion. In Digestive Physiology and Metabolism in Ruminants; Ruckebusch, Y., Thivend, P., Eds.; M.T.P. Press Ltd.: Lancaster, England, 1980; 665.

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