The Nutritive Value of Alfalfa Hay. IV. Beet Pulp, Corn Gluten Meal and Soybean Oil Meal as Supplements to an All-Alfalfa Hay Ration for Milk Production

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Abstract
Sixteen cows which had been depleted of the grain factors) or milk-stimulating factor(s) were used in 21 trials to study the effect on milk production when part of the total digestible nutrients (T.D.N) in an all-hay ration was replaced with either beet pulp, sugar beets, corn gluten meal or soybean oil meal. A significant increase in 4% fat-corrected milk (F.C. M) was obtained in 9 of 10 trials when various levels of beet pulp or sugar beets replaced an equal amount of T.D.N. in the hay. In 9 of 11 trials a significant increase in F.CM. was obtained when various amts. of corn gluten meal or soybean oil meal replaced an equal amt. of T.D.N. in the hay. The per cent of butterfat in the milk tended to increase when beet pulp or sugar beets replaced part of the hay. In view of the low fat content of beet pulp, sugar beets arid most of the corn gluten meals and soybean oil meals used in these trials, it is apparent that the first deficiency of an all-hay ration for milk production is not fat per se. The results indicate that the "so-called" grain factor(s) or the unidentified milk-stimulating factor(s) is also stored in beet pulp, sugar beets, corn gluten meal and soybean oil meal.