| Effects of dietary nitrogen source and concentration in high-grain diets on finishing steer performance and nutrient digestion. | |
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MedLine Citation:
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PMID: 9331888 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two experiments were designed to evaluate dietary N source and concentration on finishing steer performance and nutrient digestion. In Exp. 1, 100 steers were used in a randomized complete block design experiment with 2 x 2 + 1 factorially arranged treatments. Diets contained 1.93 or 2.24% N supplemented by urea or soybean meal (SBM), or 2.24% N supplemented by cottonseed meal (CSM). Steers fed SBM-supplemented diets gained 13% faster (P < .01) and were 9% (P < .01) more efficient converting feed to gain than steers receiving urea. Steers fed diets containing 2.24% N were 4% (P < .05) more efficient than those fed diets containing 1.93% N. Steers fed CSM-supplemented diets gained 6% (P < .10) less efficiently than steers receiving SBM. Increasing dietary N with urea from 1.93 to 2.24% decreased carcass weights 3%, whereas increasing dietary N with SBM increased carcass weights 3%. Carcass-adjusted gains were reduced 8% by increasing urea from .9 to 1.5% but increased 7% by increasing SBM from 6.1 to 10.5% of DM. In Exp. 2, four ruminally and duodenally cannulated steers (390 kg) were used in a 4 x 4 Latin square design experiment to evaluate urea and SBM supplementation on digestion. Diets contained no supplemental N, 1.84% N with urea or SBM as the supplement, or 2.16% N with SBM as the supplement. Total tract starch digestion, duodenal microbial N flow, and efficiency of microbial protein synthesis in the rumen were higher (P < .10) in steers fed SBM- than in those fed urea-supplemented diets. Supplementation with SBM increased metabolizable protein supply and dietary energy utilization. |
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Authors:
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C T Milton; R T Brandt; E C Titgemeyer |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of animal science Volume: 75 ISSN: 0021-8812 ISO Abbreviation: J. Anim. Sci. Publication Date: 1997 Oct |
Date Detail:
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Created Date: 1997-12-31 Completed Date: 1997-12-31 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 2813-23 Citation Subset: IM |
Affiliation:
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Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Body Composition / drug effects, physiology Cattle / growth & development*, metabolism*, physiology Cereals* Diet / veterinary* Dietary Supplements Digestion / physiology* Dose-Response Relationship, Drug Eating / physiology Male Nitrogen / analysis, metabolism, pharmacology* Random Allocation Rumen / metabolism, physiology Soybeans / chemistry, metabolism Zea mays / chemistry, metabolism |
| Chemical | |
Reg. No./Substance:
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7727-37-9/Nitrogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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