| Enteric methane production and greenhouse gases balance of diets differing in concentrate in the fattening phase of a beef production system. | |
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MedLine Citation:
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PMID: 21383032 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The purposes of this study were to i) assess the effects of three high-concentrate diets on enteric methane production, total tract digestibility, and rumen fermentations of beef cattle and ii) evaluate by life cycle assessment the potential impacts of these feeding systems on the environment. Six bulls (age: 12.4 months and BW: 417 kg, respectively, at mid-experiment) of Blond d'Aquitaine breed were assigned to three dietary treatments in a replicated 3 x 3 Latin square design. Diets consisted of 1) 49% natural grassland hay, 41% ground corn grain and 10% soybean meal (H); 2) 63% corn silage, 21% ground corn grain and 16% soybean meal (CS); and 3) 70% ground corn grain, 16% soybean meal and 14% wheat straw (C). Daily methane emission (g/d), measured using the sulfur hexafluoride tracer technique, were similar for diets H and CS and 56% higher than for diet C (P < 0.001). This difference between diets was maintained when CH(4) output was expressed by unit of feed intake (P < 0.001) or digested feed (P < 0.001). Gross energy intake loss as CH(4) averaged 6.9% for H and CS diets and of 3.2% for diet C (P < 0.001). Organic matter intake and gross energy intake did not differ between diets. Organic matter digestibility was lower for diet H than for diets CS and C (P = 0.008). Digestibility of NDF was highest for diet H, intermediate for diet CS, and lowest for diet C (P = 0.02) with ADF digestibility being similar between diets H and CS and higher than diet C (P < 0.001). The rumen pH 5 h post-feeding was lower for animals fed diet C compared to the other two diets (5.1 vs 5.9 on average, respectively; P < 0.001). Total methane emission (enteric + manure) was lowest for diet C, whereas nitrous oxide and carbon dioxide emissions were highest for diet C. Total greenhouse gas (GHG) emissions were lowest for diet C when carbon sequestration by grasslands is not taken into account. |
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Authors:
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M Doreau; H M G van der Werf; D Micol; H Dubroeucq; J Agabriel; Y Rochette; C Martin |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-7 |
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: 2011-3-8 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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INRA, UR1213 Herbivores, F-63122 Saint-Genès Champanelle, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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