Effects of expanding field beans on parameter of ruminant nitrogen and energy metabolism in vitro and in vivo.
- Publikations-Art
- Vortrag
- Autoren
- Schneider, K., H. Steingaß, C. Bissinger and W. Drochner.
- Erscheinungsjahr
- 2002
- Herausgeber
- Kahl
- Tagungsname
- 5th International Kahl-Symposium
- Tagungsort
- Hamburg
- Tagungsdatum
- 22.-23. April 2002
- Schlagworte
- cow, energy metabolism, field bean
In the present study, the effects of expanding field beans on parameters of rumen fermentation in vitro and in vivo, energy and nitrogen balance in cows as well as feed intake, milk production and milk composition was investigated in comparison to raw field beans. Expansion lead to an increased rate and extent of gas production in vitro which means a faster rate of degradation of organic matter. On the other hand, a trend for reduced release of NH3 at short times of incubation indicates a reduced protein degradability. A higher amount of utilisable protein up to 12 hrs of incubation in expanded beans results both from increased microbial protein synthesis and higher quantities of bypass protein. When field beans were fed to cows in a total mixed ration containing 25 % beans in DM, no effects of treatment were found for rumen pH. Expansion lowered rumen concentrations of total VFA, especially of acetic acid and lead to a significant lower acetate/propionate ratio. In accordance with the results in vitro, rumen NH3 concentration was lower in the group fed treated beans. Parameters of nitrogen and energy balance in cows showed only minor differences between treatments. In the production trial, a trend for higher DM intake and milk yield was observed in cows receiving expanded beans. On the other hand, milk fat concentration was significantly lower in the group fed expanded beans, leading to an equal production of FECM. Calculated energy supply was higher in the treated group and lead to an increased live weight gain. The results of both, in vitro and in vivo studies, show certain positive effects of expanding on carbohydrate and protein metabolism. A faster rate of carbohydrate fermentation due to expansion is of no distinct advantage for ruminants and the beneficial effect on the properties of protein seem to be not pronounced enough to increase productivity of cows, however.