| Substitution of wheat dried distillers' grains with solubles for barley grain or barley silage in feedlot cattle diets: intake, digestibility and ruminal fermentation. | |
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MedLine Citation:
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PMID: 21454864 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The objective of this study was to evaluate the effects of substituting wheat dried distillers' grains with solubles (DDGS) for barley grain and barley silage on intake, digestibility, and ruminal fermentation in feedlot beef cattle. Eight ruminally cannulated Angus heifers (initial BW 455 ± 10.8 kg) were assigned to a replicated 4 × 4 Latin square design with 4 treatments: control, low (25%), medium (30%), and high (35%) wheat DDGS (DM basis). The diets consisted of barley silage, barley concentrate, and wheat DDGS in ratios of 15:85:0 (CON), 10:65:25 (25DDGS), 5:65:30 (30DDGS), and 0:65:35 (35DDGS) (DM basis), respectively. The diets were formulated such that wheat DDGS was substituted for both barley grain and barley silage to evaluate whether wheat DDGS can be fed as a source of both energy (grain) and fiber in feedlot finishing diets. Intakes (kg/d) of DM and OM were not different, whereas those of CP, NDF, ADF and EE were greater (P < 0.01), and intake of starch was less (P < 0.01) for 25DDGS compared to CON diet. The digestibilities of CP, NDF, ADF and EE in the total digestive tract were greater (P < 0.05) for 25DDGS versus CON. Ruminal pH and total VFA concentrations were not different between 25DDGS and CON diets. Replacing barley silage with increasing levels of wheat DDGS (i.e., from 25DDGS to 35DDGS) linearly reduced (P < 0.05) intakes of DM and other nutrients without altering CP intake. In contrast, digestibilties of DM and other nutrients in the total digestive tract linearly increased (P < 0.05) with increasing wheat DDGS except for that of EE. Additionally, with increasing levels of wheat DDGS, mean ruminal pH tended (P = 0.10) to linearly decrease, and ruminal pH status declined with longer (P = 0.04) duration of pH < 5.5 and < 5.2, and greater (P = 0.01) curve area under pH < 5.8 and < 5.5 without altering ruminal VFA and NH(3)-N concentrations. Results indicated that wheat DDGS can be effectively used to replace both barley grain and silage at a moderate level to meet energy and fiber requirements of finishing cattle. However, when silage is low (< 10%), wheat DDGS is not an effective fiber source, so replacing forage fiber with wheat DDGS in finishing diets decreases overall ruminal pH status even though the rapidly fermentable starch content of the diet is considerably reduced. |
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Authors:
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Y L Li; T A McAllister; K A Beauchemin; M L He; J J McKinnon; W Z Yang |
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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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Research Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, T1J 4B1, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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