B. Laxter and K. L. , The energy metabolism of ruminants, p.99, 1962.

B. Laxter, K. L. , and W. S. Il-s-o-n-r, The voluntary intake of roughages by steers, Anim. Prod, vol.19, issue.4, pp.35-36

B. Laxter, K. L. Wmnmw:-v, F. W. , D. Vi, and D. J. , The voluntary intake of food by sheep and cattle in relation to their energy requirements for maintenance, Aniin. Prod, vol.19, issue.7, pp.66-71

M. Bucn, D. T. , and H. W. Emken-r, Ad libitum intake and digestibility of several alfalfa hays by cattle and sheep, J. Dairy Sci, vol.19, issue.47, pp.86-86

E. Ca and M. C. De-ma-r-q-ui-lly, Comparaison entre le pâturage et l'affouragement en vert pour la production de viande bovine, Ann. Zootech, vol.19, issue.18, pp.277-306

Q. Damwx and V. C. Fmarq-ui-lly, Valeur alimentaire de l'herbe des prairies temporaires aux stades d'exploitation pour le pâturage. II. Quantité ingérée par les vaches laitières, Ann. Zootech, vol.19, issue.26, pp.66-66

I. Ngalls, J. R. , T. J. , and T. B. Esar-m, Comparison of responses to various forages by sheep, rabbits and heifers, J. anim. Sci, vol.19, issue.24, pp.6-11

J. Ournft, M. , and J. R. Arrige, rg 7 o, Journées Féd. Europ. Zootech, 1970.