475. Studies on variations in the solids-not-fat content of milk: V. Variations due to winter feeding practice

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Abstract
During the twelve years from 1935 to 1946 the type of foods given to sixty-one Dairy Shorthorn first calvers during the months of February and March changed so that the dry-matter intake of the cows rose and the dietary fat fell, but there was little change in the Protein and Starch equivalent they received. Milk yield varied directly with the amount of fat and starch equivalent in the diet and inversely with the dry matter. The solids-not-fat percentage of milk varied directly with the amount of starch equivalent, and inversely with the dry matter content, of the diet. The milk-fat percentage was not influenced by the foods given. It was shown that the fall in the level of solids-not-fat in the milk was largely due to the increase in the dry matter intake of the cows.