Furanocoumarins in tedera do not affect ruminal fermentation in continuous culture
M. H. Ghaffari A , Z. Durmic A C F , D. Real B C D E , P. Vercoe A C , G. Smith B and C. Oldham B
+ Author Affiliations
- Author Affiliations
A School of Animal Biology, The University of Western Australia M085, 35 Stirling Highway, Crawley, WA 6009, Australia.
B Department of Agriculture and Food, Western Australia (DAFWA), 3 Baron-Hay Court, South Perth, WA 6151, Australia.
C Future Farm Industries Cooperative Research Centre, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
D School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
E Centre for Legumes in Mediterranean Agriculture, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
F Corresponding author. Email: zoey.durmic@uwa.edu.au
Animal Production Science 55(4) 544-550 https://doi.org/10.1071/AN13335
Submitted: 8 August 2013 Accepted: 20 January 2014 Published: 25 March 2014
Abstract
The objective of this study was to investigate the effects of the forage shrub tedera (Bituminaria bituminosa) on nutrient digestibility, rumen microbial fermentation and furanocoumarins degradation in the rusitec. The variables were measured in fermentation liquid on Days 13 and 17 and were compared with a control (lucerne hay). Overall, tedera had greater (P < 0.05) neutral detergent fibre and acid detergent fibre digestibility than lucerne hay on both days of the experiment, but on Day 17 it had lower (P < 0.01) dry matter and crude protein digestibility than lucerne hay. There were no significant differences in concentration of NH3-N and pH between treatments, but NH3-N concentrations in both treatments were lower (P < 0.05) on Day 17 than on Day 13. The concentration of total volatile fatty acids in vessels were not affected by treatments, but the concentration of acetate was lower and acetate-to-propionate ratio higher (P < 0.05) in tedera than lucerne hay on Day 13 of the experiment. Furanocoumarins were detected in the tedera treatment only. Their concentration in the fermentation liquid increased immediately after the addition of the plant material to the fermenter, reaching highest concentrations after 2 h. These concentrations gradually declined over the next two sampling times, but 6 h after the ‘feeding’, they were still detectable in the fermentation liquid. It was concluded that (i) tedera had in vitro digestibility and fermentability variables comparable to lucerne; (ii) furanocoumarins were degraded in the fermentation fluid, and (iii) furanocoumarins from tedera did not seem to impede microbial fermentation. Tedera may provide an alternative feed source to hay and grain for filling the summer–autumn feed gap without negatively affecting nutrient digestibility and rumen microbial fermentation.
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