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Animal Breeding and Genetics
Asian-Australasian Journal of Animal Sciences 2004;17(12): 1674-1680.
DOI: https://doi.org/10.5713/ajas.2004.1674    Published online January 1, 2004.
Model Prediction of Nutrient Supply to Ruminants from Processed Field Tick Beans
P. Yu, D. A. Christensen
The objective of this study was to compare the Dutch DVE/OEB system and the NRC-2001 model in the prediction of supply of protein to dairy cows from processed field tick beans. Comparisons were made in terms of 1) ruminally synthesized microbial CP, 2) truly absorbed protein in the small intestine, and 3) degraded protein balance. The results showed that the predicted values from the DVE/OEB system and the NRC-2001 model had significant correlations with high R (>0.90) values. However, using the DVE/OEB system, the overall average microbial protein supply based on available energy was 16% higher and the truly absorbed protein in the small intestine was 9% higher than that predicted by the NRC-2001 model. The difference was also found in the prediction of the degraded protein balances (DPB), which was 5% lower than that predicted based on data from the NRC-2001 model. These differences are due to considerably different factors used in calculations in the two models, although both are based on similar principles. It need to mention that this comparison was based on the limited data, the full comparison involving various types of concentrate feeds will be investigated in the future.
Keywords: Field Tick Bean; NRC-2001 Model; DVE/OEB System; Feed Processing; Protein Evaluation; Ruminants

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