| Effects of haylage and monensin supplementation on performance, carcass characteristics, and ruminal metabolism of feedlot cattle fed diets containing 60% dried distillers grains. | |
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MedLine Citation:
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PMID: 21454865 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The objectives of this research were to determine the interaction of monensin and haylage supplementation for steers fed 60% dried distillers grains (DDGS) on (1) mineral status, performance, and carcass characteristics, and (2) ruminal pH, H(2)S and short chain fatty acid (SCFA) concentrations. Exp. 1: Angus-cross steers (n = 168; BW = 277 ± 67 kg) were blocked by BW and allotted in a 2 x 2 factorial arrangement of treatments to 24 pens. Dietary treatments were: (1) 0 mg monensin/kg diet and 0% haylage, (2) 33 mg monensin/kg diet and 0% haylage, (3) 0 mg monensin/kg diet and 10% haylage, and (4) 33 mg monensin/kg diet and 10% haylage. The remainder of the diet was 60% DDGS, 10% corn silage, 15% supplement and corn (either 5 or 15%) on a DM basis. When supplemented with 0 mg monensin/kg diet, added haylage increased ADG by 5.7%, whereas, when supplemented with 33 mg monensin/kg diet, added haylage increased ADG by 13% (P < 0.01). There were no interactions of monensin and haylage for DMI or G:F (P ≥ 0.36). Haylage inclusion increased (P < 0.01) DMI and decreased (P < 0.01) G:F. There were no interactions on plasma mineral concentrations; however, over time, plasma Cu concentrations were decreased (P < 0.01), whereas, plasma ceruloplasmin and S concentrations increased (P < 0.01). There were no treatment effects (P ≥ 0.08) on carcass characteristics. Cattle fed 60% DDGS diets benefitted from increased dietary forage and the effects of monensin and forage were additive for ADG and final BW. Exp. 2: Ruminally fistulated steers (n = 8; BW = 346 ± 34 kg) were used in a replicated 4 x 4 Latin Square design and randomly assigned to the diets used in Exp. 1. Haylage inclusion increased ruminal pH from 1.5 through 12 h post-feeding and the effects of monensin supplementation were additive (P < 0.05). From 1.5 through 9 h post-feeding, steers fed 33 mg monensin/kg diet tended to have reduced (P ≤ 0.10) concentrations of H(2)S when compared to steers fed 0 mg monensin/kg diet. Acetate:propionate ratio at 6 h post-feeding was 0.94, 0.93, 1.29, and 1.35 for diets 1 to 4, respectively (P < 0.01); total lactate was low, regardless of treatment (range: 0.94 to 1.42 µmol/mL). Sulfuric acid in DDGS, not ruminal SCFA, may be responsible for the low rumen pH observed and may influence the maximum inclusion of DDGS in cattle diets. Monensin supplementation decreased H(2)S concentration and may decrease the risk of polioencephalomalacia for cattle fed high DDGS diets. |
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Authors:
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T L Felix; S C Loerch |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-31 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-4-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Animal Sciences, The Ohio State University, Wooster, 44691. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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