1. Aricultural Research Council. 1981. The Nutrient Requirements of Pigs. Commonwealth Agricultural Bureaux, Farnham Royal, Slough. U. K.
2. Barnes, R. H., Moore, A. U., Reid, I. M., and Pond, W. G. 1967. Am. Diet. Assoc. 51, 34.
3. Braude, R., Mitchell, K. G., and Suffolk, S. F. 1969. J. Inst. Anim. Technicians2043.
4. Brown, W. R., Krook, L., and Pond, W. G. 1966. Cornell Vet., Suppl. 156108.
5. Bustad, L. K., McClellan, R. A., and Burns, M. P., eds. 1966. Swine in Biomedical Research. Frayn, Seattle.