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Effects of Processing and of Feeding Hay on the Digestibility of Soybean Hulls

Cornell University, Ithaca, New York^1,2,

Abstract

A series of digestion trials with steers and sheep was conducted on soybran flakes and soybean hulls. Soybran flakes had a significantly higher digestibility than either ground or unground soybean hulls when they were used as the only feed. However, when hay was added to the ration, the digestibility of the soybran flakes, ground soybean hulls and unbran flakes, soybran flakes and hay, soybean hulls and hay were extremely similar at all observation times, thus they were averaged together. Therefore the line labeled "other comparisons" is the average of nine observations. The curve for soybean hulls fed alone is the average of three observations. The similar excretion patterns for soybran flakes fed with and without hay are in agreement with Johnson et al. (1962). The soybean hulls were excreted at a faster rate than the other ground soybean hulls was markedly increased and there was no longer any large difference between them. Although the hulls contained 36.4% fiber they were highly digested and the TDN was calculated to be 72.9%.

The rates of passage were studied, using a stained particle technique, and a faster rate was observed when raw soybean hulls were fed alone than for soybran flakes fed with and without hay and for raw soybean hulls fed with hay.

¹ Department of Animal Husbandry.

² The generous assistance of L. V. Curtin, Central Soya, Decatur, Indiana, in supplying the soybran flakes and soybean hulls is gratefully acknowledged.

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