Document Detail

Evaluation of the fermentation dynamics of soluble crude protein from three protein sources in continuous culture fermenters.
MedLine Citation:
PMID:  18344304     Owner:  NLM     Status:  MEDLINE    
Eight dual-flow continuous culture fermenters (1.03 +/- 0.05 L) were used to assess differences in microbial degradation of the soluble CP fraction of canola meal (CMSCP), soybean meal (SBMSCP), and fish meal (FMSCP) using a completely randomized design with two 9-d experimental periods and a solution of tryptone as a control treatment (control). All fermenters received the same basal diet (58% ground corn, 40% canary grass hay, 0.4% vitamin-mineral premix, 1% CaCO(3), 0.6% salt on a DM basis) in 8 equal portions daily. During sampling on the last 3 d of each period, 90-mL doses containing soluble CP were infused into the fermenters 30 min after the beginning of the first and last feedings of the day. The total amount of soluble CP supplied by the infusions of FMSCP, CMSCP, and SBMSCP was 3.2 g/d, representing 24% of the daily dietary CP intake. Infusion of FMSCP resulted in the greatest (P < 0.05) NH(3)-N concentration (4.6 +/- 0.40 mg/dL) compared with the other treatments (0.5 +/- 0.40 mg/dL). Microbial N flow (g/d) from the fermenters was also greatest (P < 0.05) with FMSCP (1.42 +/- 0.062) compared with the other soluble CP fractions (1.08 +/- 0.062). The efficiency of microbial protein synthesis tended to be lowest with the control diet, and the efficiency of N utilization was lowest with FMSCP treatment. These results indicate that N was limiting microbial growth in the control diet, and there was more rumen-available N with the FMSCP diet compared with the other dietary treatments. The extent of degradation of the soluble CP fraction from fish meal, soybean meal, and canola meal was determined to be 99, 30, and 37% of soluble CP, respectively. These results indicate that the soluble CP fraction is not 100% degraded in all feeds and that assuming a high degradation extent of the soluble CP fraction from soybean meal and canola meal may result in an underestimation of the supply of undegradable protein from these protein sources.
A Bach; M Ruiz Moreno; M Thrune; M D Stern
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-03-14
Journal Detail:
Title:  Journal of animal science     Volume:  86     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-05-21     Completed Date:  2008-09-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1364-71     Citation Subset:  IM    
Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain.
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MeSH Terms
Animal Feed
Bacteria / growth & development,  metabolism
Bacterial Proteins / biosynthesis*
Diet / veterinary
Dietary Proteins / metabolism*
Dietary Supplements
Fatty Acids, Monounsaturated
Nitrogen / metabolism*
Random Allocation
Rumen / metabolism*,  microbiology
Reg. No./Substance:
0/Bacterial Proteins; 0/Dietary Proteins; 0/Fatty Acids, Monounsaturated; 120962-03-0/canola oil; 7727-37-9/Nitrogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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