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Comparison of Fibrous Materials as Modifiers of In Situ Ruminal Degradation of Corn Gluten Meal

Department of Animal Science, University of Padova, Padova, Italy
Department of Dairy Science, Virginia Agricultural Experiment Station, College of Agriculture and Life Sciences, Virginia Polytechnic Institute and State University, Blacksburg 24061-4315

Degradability of corn gluten meal protein in situ is grossly underestimated compared with in vivo measurements. To study the influence of corn gluten meal mixed with different fibrous sources on in situ ruminal DM and CP degradation, bags containing meal alone or mixed with corn cobs, wheat straw, or sawdust, respectively, were suspended in the rumen of two lactating Holstein cows for 0, 4, 12, 24, 48, 72, or 120 h. The three fibrous sources also were incubated alone to determine their degradation pattern. Cytosine was used as a bacterial marker to correct the in situ residues for bacterial contamination. Sawdust was almost completely resistant to ruminal degradation, and straw was slowly degraded to a final extent of 35.3% of total DM. The DM in corn cobs had a degradable fraction of 63.7% and a rate of disappearance higher than that of corn gluten meal incubated alone. The DM and CP degradation rates of meal were not modified when feed was mixed with corn cobs. Incubation with straw and sawdust increased rate of disappearance of DM and CP of corn gluten meal (2.1 and 1.2%, respectively). Ruminal turnover was assumed to be 6%h, and CP degradabilities of corn gluten meal were 30.6 and 25.1% when the feed was incubated with straw and sawdust, respectively.

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