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In a study of the value of roughage in the dairy ration, several heifers have been maintained at this station on a roughage-free diet from birth to over 18 months of age. A similar group was reared on the same mixture of concentrates plus approximately 14 per cent of sulphite wood paper pulp. During this work, digestion trials were conducted with heifers from each group. The results are here reported. PROCEDURE Three digestion trials were conducted, four heifers being used in each. The animals received the same feed mixtures that they had been receiving since two months of age except for the mixture used in trial 3. During this trial and for ten days before the co]tection period, they received mixture 3, which differed from mixture 1 only in being more finely ground. This trial was intended to determine the effect of fine grinding on digestibility: mixture 2 was more finely ground than mixture 1, because of the method of preparation necessary to incorporate the paper pulp. The heifers received daily a medicinal cod liver oil, the total amount of which is shown in table
Mead et al. (1935) studied this question.