Modelling the metabolic characteristics of proteins in dairy cattle from co-products of bioethanol processing: comparison of the NRC 2001 model with the DVE/OEB system

Nuez-Ortín, Waldo G., and Yu, Peiqiang (2011) Modelling the metabolic characteristics of proteins in dairy cattle from co-products of bioethanol processing: comparison of the NRC 2001 model with the DVE/OEB system. Journal of the Science of Food and Agriculture, 91 (3). pp. 405-411.

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Abstract

Background: Co-products from bioethanol processing include wheat dried distillers grains with solubles (DOGS), corn DOGS, blend DDGS (e.g. wheat/corn at 70 : 30, 60 : 40 or 50 : 50 w/w), triticale DDGS, barley DDGS and pea DDGS. The objective of this study was to compare two systems, the DVE/OEB system versus the NRC 2001 model, in modelling the metabolic characteristics of proteins in dairy cattle from different types of co-products (DDGS) from different bioethanol processing plants.

Results: The predicted values from the NRC 2001 model were 10% higher (P < 0.05) in truly absorbable rumen-synthesised microbial protein in the small intestine, 10% lower (P < 0.05) in truly absorbed rumen-undegraded feed protein in the small intestine, 30% lower (P < 0.05) in endogenous protein and 2% lower (P < 0.05) in total truly absorbed protein in the small intestine than the predicted values from the DVE/OEB system. However, no significant difference was detected in terms of the degraded protein balance between the two models (P > 0.05).

Conclusion: The sensitivity of the two models in detecting differences among DDGS types and between bioethanol plants was similar. The two models coincided in the superior protein value of blend DDGS as well as in the more optimal degraded protein balance (DPB) for corn DDGS. Although the differences between the DVE/OEB system and the NRC 2001 model were significant (P < 0.05) for most outputs owing to differences in some of the concepts and factors used in modelling, the correlations between total truly absorbed protein (DVE) and metabolisable protein (MP) values and between degraded protein balances (DPB(OEB) vs DPB(NRC)) were also significant (P < 0.05).

Item ID: 45980
Item Type: Article (Refereed Research - C1)
Keywords: modelling nutrient supply, protein metabolic characteristics, bioethanol processing, co-products
ISSN: 1097-0010
Funders: Agricultural Bioproducts Innovation Programme of Agriculture, Advancing Canadian Agriculture and Agri-Food, Beef Cattle Research Council, Saskatchewan Agricultural Development Fund
Date Deposited: 10 Oct 2016 02:53
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070204 Animal Nutrition @ 100%
SEO Codes: 86 MANUFACTURING > 8603 Processed Non-Food Agriculture Products (excl. Wood, Paper and Fibre) > 860304 Prepared Animal Feed @ 100%
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