Other| Volume 15, ISSUE 3, P185-190, September 1999

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Effects of Cull Beans, Sunflower Meal, and Canola Meal as Protein Supplements to Beef Steers Consuming Grass Hay on In Situ Digestion Kinetics1

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      Two ruminally cannulated steers were used in an in situ incubation study to test the effects of raw cull Great Northern beans (Phaseolus vulgaris), canola meal, and sunflower meal on rate and extent of digestion of forage DM, NDF, ADF, and N and to compare the DM and N digestibilities of the supplements. Steers were allowed ad libitum access to medium quality grass hay and were assigned in each of five periods to one of five supplemental treatments. The five treatments included: 1) unprocessed Great Northern beans to supply 182 g/d CP (GNB); 2) canola meal to supply 182 g/d CP (CM); 3) a mixture of Great Northern beans and sunflower to each supply 91 g/d CP (MIX); 4) sunflower meal to supply 182 g/d CP (SFM+); and 5) sunflower meal to supply 91 g/d CP (SFM−). Each period consisted of a 7-d adaptation period, 3-d intake period, and 4-d incubation period. Two bags of supplement, two bags of forage, and two blanks were incubated for 0, 4, 8, 12, 18, 24, 36, 48, 72, or 96 h. Treatment had no effect on rate, extent of digestion, or discrete lag time of forage DM, NDF, or ADF (P>0.10). Compared with the SFM+ treatment, forage N degraded at a faster rate when steers were on the GNB (P=0.06), CM (P=0.02), or SFM− (P=0.02) treatments. Forage N in the MIX treatment degraded slower than that in the GNB treatment (P=0.03). No differences (P>0.10) were detected for forage N lag time or extent of digestion. There were no differences in the rate of digestion of supplement DM or N (P>0.80), but canola meal had a greater extent of supplement DM degradation than the sunflower meal from the SFM+ treatment (P=0.13). When supplemented to medium quality hay diets, Great Northern beans, canola meal, or a mixture of Great Northern beans and sunflower meal had similar effects on in situ forage digestion kinetics. Anti-nutritional factors in the beans did not appear to alter rumen digestion of the tested forage.

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