1. Leitch, I., and Godden, w., Imp. Bureau Animal Nutrition, Tech. Comm. 14 (1941).
2. Mitchell, K. J., Proc. 9th Ann. Conf. N.Z. Soc. An. Prod. (1949).
3. Cochrane, E. R., “The Milch Cow in England” (Faber and Faber, 1946).
4. Edwards, J., J. Dairy Res., 7 (1936).
5. Halnan, E. T., Proc. Nutrition Soc., 1 (1944).