| Effects of nitrogen fertilization and dried distillers grains supplementation: Nitrogen use efficiency. | |
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MedLine Citation:
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PMID: 21148781 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In a 3-yr study, 135 crossbred steers (330 ± 10 kg) were used in a randomized complete block design to evaluate corn dried distillers grains plus solubles (DDGS) fed to yearling steers as a substitute for forage and N fertilizer and its effect on N use efficiency in yearling steers grazing smooth bromegrass pastures. Steers were initially stocked at 6.8 (animal unit months (AUM)/ha on non-fertilized smooth bromegrass pastures (CONT), at 9.9 AUM/ha on smooth bromegrass pastures fertilized with 90 kg N/ha·(FERT), or at 9.9 AUM/ha on non-fertilized smooth bromegrass pastures with 2.3 kg (DM) of DDGS supplemented daily per steer (SUPP). Paddock was the experimental unit with 3 replications per treatment per yr for 3 yr. Paddocks were strip-grazed and put-and-take cattle were used to maintain similar grazing pressure among treatment paddocks during the 160-d grazing season. While steers consumed less forage (P < 0.01), total N intake for SUPP was greater (P < 0.01) per steer and per ha than FERT and both were greater (P < 0.01) than CONT. Nitrogen retention for SUPP steers was increased (P < 0.01) by 31% compared to CONT and FERT. Nitrogen retention per ha for SUPP was 30% and 98% greater (P < 0.01) than for FERT and CONT respectively. Nitrogen excretion per steer and per ha were also greater (P < 0.01) for SUPP than FERT and both were increased (P < 0.01) compared to CONT. Animal N use efficiency was similar (P = 0.29) for CONT, FERT and for SUPP steers. However, system-based N use improved (P < 0.01) by 144% for SUPP compared to FERT. Dried distillers grains increased N intake and N excretion in yearling steers. However, due to improvements in gain and increases in stocking rate of pastures, DDGS can be a useful tool to increase N use efficiency of smooth bromegrass grazing systems. |
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Authors:
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M A Greenquist; A K Schwarz; T J Klopfenstein; W H Schacht; G E Erickson; K J Vander Pol; M K Luebbe; K R Brink; L B Baleseng |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2010-12-10 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-12-14 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: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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