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- Title
Effects of monensin supplementation on ruminal metabolism of feedlot cattle fed diets containing dried distillers grains.
- Authors
Felix, T. L.; Pyatt, N. A.; Loerch, S. C.
- Abstract
Two experiments were conducted to evaluate the effects of monensin and dried distillers grains with solubles (DDGS) on ruminal metabolism in 8 fistulated steers. In Exp. 1, treatments were (DM basis): 1) 0 mg monensin/kg diet DM, 2) 22 mg monensin/ kg diet DM, 3) 33 mg monensin/kg diet DM, and 4) 44 mg monensin/kg diet DM. The remainder of the diet was 10% com silage, 60% DDGS, 10% com, and 20% mineral supplement that used ground com as the carrier. There was no effect (P > 0.80) of dietary monensin inclusion on DMI. Increasing dietary monensin did not affect (P > 0.05) ruminal VFA concentrations or lactic acid concentrations. There was no effect (P > 0.15) of increasing dietary monensin concentration on ruminal hydrogen sulfide gas (H2S) and liquid sulfide (S2~) concentrations, or ruminal pH. In Exp. 2, treatments were arranged in a 2 x 2 factorial and contained (DM basis): 1) 0 mg monensin/kg diet DM + 25% DDGS inclusion, 2) 0 mg monensin/kg diet DM + 60% DDGS inclusion, 3) 44 mg monensin/kg diet DM + 25% DDGS inclusion, and 4) 44 mg monensin/kg diet DM + 60% DDGS inclusion. The remainder of the diet was 15% com silage, com, and 20% mineral suplement that used ground com as a carrier. With 60% dietary DDGS inclusion, DMI decreased (P < 0.01) when compared with 25% DDGS inclusion. With 25% DDGS in the diet, 0 h postfeeding acetate concentration was decreased compared with when 60% DDGS was fed (P < 0.01). A similar response (P < 0.01) occurred for total VFA concentrations at 0 h postfeeding. However, at 3 and 6 h postfeeding, propionate concentrations increased (P < 0.05) in cattle fed the 60% DDGS diets, regardless of monensin inclusion. This increase in propionate concentrations contributed to the increase (P = 0.03) in total VTA concentrations at 3 h postfeeding when 60% DDGS diets were fed. There was no interaction detected (P > 0.05) for H2S or S2- concentrations in Exp. 2. Feeding 60% DDGS diets increased mean H0S by 71% when compared with feeding 25% DDGS diets. Similar to the response observed for H,S, feeding 60% DDGS diets increased mean S2- by 64% when compared with feeding 25% DDGS diets. Although these studies did not show beneficial effects of monensin supplementation on ruminal pH, VFA, or H,S concentrations, adverse rumen conditions, notably low ruminal pH, when high DDGS diets were fed may have precluded the effects of monensin from being realized.
- Subjects
MONENSIN; DIETARY supplements; METABOLISM; RUMINANTS; BEEF cattle; DISTILLERS feeds
- Publication
Journal of Animal Science, 2012, Vol 90, Issue 11, p3905
- ISSN
0021-8812
- Publication type
Article
- DOI
10.2527/jas.2011-5059