Abstract
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.
Highlights
Field tick beans are high in protein and starch contents as potential sources for ruminants
Little systematic research has been done on quantitative prediction of nutrient supply from field tick bean affected by different combinations of heating temperature and duration with a model
Using the DVE/OEB system, the overall mean for microbial protein supply based on energy, or based on ruminally degraded protein were higher
Summary
Field tick beans are high in protein and starch contents as potential sources for ruminants. Despite the fact that field tick bean have high protein and starch content, their use in dairy cow feeding is inefficient. Dry roasting is a relatively simple, safe and economical procedure to reduce rumen degradation and increase intestinal availability of protein or starch. Little systematic research has been done on quantitative prediction of nutrient supply from field tick bean affected by different combinations of heating temperature and duration with a model. There are several sophisticated models such as ARC, NRC, NKJ-NJF, PBI and DVE/OEB (Tamminga et al., 1994) existed, which can be used to quantitatively predicted such protein nutrient supply to dairy cows, both in the rumen and intestines (Yu et al, 2003). Based on principles in existing models, modern protein evaluation systems: the
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