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Digestibility of Soybean Hulls and Flakes and the in Vitro Digestibility of the Cellulose in Various Milling By-Products^{1, 2,}

Department of Animal Science, Ohio Agricultural Experiment Station, Wooster

ABSTRACT

The production of soybean meals containing 50 vs. 44% crude protein has diverted large amounts of soybean hulls from meal production into mill by-product feeds. The potential use of hulls as a source of fiber in ruminant rations has stimulated interest in a study of their digestibility and utilization.

Since soybean hulls contain 40–50% cellulose on an air-dry basis, it was decided to investigate also the in vitro-digestibility of the cellulose in a number of other milling by-products and dehydrated alfalfa meal (13% protein). All materials were ground to 40 mesh (with the exception of corn cobs, which were ground to 0.5-mm. mesh) in a Wiley mill and the in vitro cellulose digestibility was determined according to the procedure described by Kamstra et al. (3), as modified by Quicke et al. (4) for forages. Cellulose was determined by the method of Crampton and Maynard (2), and crude fiber by the A.O.A.C. method.

The cellulose in soybean hulls and flakes, as well as in beet pulp, proved to be highly digestible in vitro (90 to 96%), whereas the cellulose in the other products studied gave in vitro digestibilities ranging from 49 to 21% (Table 1).

¹ Approved for publication as Journal Article No. 69-58 by the Associate Director of the Ohio Agricultural Experiment Station.

² This work was supported in part by a grant-in-aid from the McMillen Feed Mills, Decatur, Ind.

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