Effect of different tannin contents in field beans on digestion parameters, feed intake and performance of dairy cows.
- Publication Type
- Contribution to conference
- Authors
- Bissinger, C., Steingaß, H. and Drochner, W.
- Year of publication
- 2005
- Published in
- Berichte der Gesellschaft für Ernährungsphysiologie
- Editor
- H. Martens
- Pubisher
- DLG-Verlags-GmbH , Frankfurt/M
- Series/labeling
- Proc. Soc. Nutr. Physiol.
- Page (from - to)
- 41
- Conference location
- Stuttgart-Hohenheim
- Conference date
- 08.-10.03.2005
- Keywords
- dairy cows, digestion parameters, field beans, tannin
Introduction: The protein of field beans is supposed to be highly degradable in the rumen. This may cause a deficit of utilizable protein in the duodenum of high yielding dairy cows. However, white-floured varieties containing small amounts of tannins and colour-floured field beans containing more tannins have to be distinguished. Tannins, especially Condensed tannins, could build stable complexes with proteins in the rumen, thus the protein degradability in the rumen may be reduced. In this experiment the colour-floured field bean Samba was compared with the white-floured Valeria. The content of Condensed tannins was 0,89% for Samba, whereas Valeria did not contain any Condensed tannins. Methods: Each field bean variety was fed in a TMR (25% cornsilage, 10% grassilage, 15% hay). To get equal CP contents in the rations, the amount of beans differed according to their protein contents: The amount of Samba (30,9% CP/8,8 MJNEL) in the diet was 32,3% and that of Valeria (33,9 % CP/9,3 MJNEL) 28,4%. The rest was made up with supplementary concentrate based on cereals and mineral mix. The investigations of the in situ degradability of DM and CP and of the rumen Parameters were carried out with four rumen fistulated lactating Holstein cows. In addition, a 10 week production trial was carried out as cross-over-design with 26 lactating Holstein cows. Results: In situ, disappearance of DM and CP and effective degradability of DM was higher for Valeria. The effective degradability of DM at outflow rates of 2, 5 and 8%/h was for Samba/Valeria: 83,6/90,3%, 74,9/80,4% and 68,0/72,7%, although the rate of degradation of Valeria was slightly lower compared to Samba. The effective degradability of CP was only slightly higher for Valeria. The diet containing Valeria effected a higher amount of VFA and the pH-value of the cows receiving Valeria was always lower in the course of time. Furthermore, the proportion of acetic and butyric acids was decreased in cows fed Valeria, whereas ...