Skip to main content Accessibility help
×
Home

Effects of yeast culture on rumen fermentation and liveweight gain in bulls fed isonitrogenous diets of barley/urea or barley/soya

  • S.M. Elhassan (a1), R.J. Wallace (a1), C.J. Newbold (a1), X.B. Chen (a1), I.E. Edwards (a2) and J.H. Topps (a2)...

Extract

Yeast culture (YC) based on Saccharomyces cerevisiae is gaining increasing acceptance as a feed additive for ruminants. Production responses to YC have been reported in growing and lactating animals. It has been suggested that these responses are at least partly due to enhanced microbial growth in and microbial nitrogen flow from the rumen (Williams and Newbold, 1990). The aim of the present study was to investigate the effect of YC on rumen fermentation, microbial growth and liveweight gain in bulls fed isonitrogenous diets containing either urea or soya.

Thirty two Limousin cross Friesian bulls (liveweight 344 kg) were allocated to treatments on the basis of previous growth rate and initial liveweight. Animals received mixed diets of barley/urea (92% rolled barley, 5% cane molasses, 1.5% urea and 1.5% minerals/vitamin mix) or barley/soya (86.75% rolled barley, 5% cane molasses, 0.75% urea, 6% soyabean meal and 1.5% minerals/vitamin mix) plus or minus 1.5 kg/ tonne YC (Yea-sacc1026 , Alltech, UK) (Table 1). YC was added to the diet prior to mixing. All rations were offered ad libitum twice daily until slaughter (460 kg). Rumen fluid samples were withdrawn by stomach tube 5 and 10 weeks after the beginning of the trial. The outflow of microbial nitrogen from the rumen was estimated from the appearance of purine derivatives in the urine as described previously (Chen et al., 1990).

Copyright

References

Hide All
Chen, X.B., Hovell, F.D.DeB., Orskov, E.R., Brown, D.S. Excretion of purine derivatives by ruminants: effect of exogenous nucleic acid supply on purine derivative excretion by sheep. British Journal of Nutrition 1990, 63, 131142.
Erasmus, L.J. The importance of duodenal amino acid profiles for dairy cows and the significance of changes in these profiles following the use of Yea-sacc1026 . In: Biotechnology in the Feed Industry Lyons, T.P. Ed. Alltech Technical Publications , Kentucky, 1991 pp 3350.
Williams, P.E.V., Newbold, C.J. Rumen Probiosis: the effects of novel microorganisms on rumen fermentation and ruminant productivity. Recent Advances in Animal Nutrition Haresign, W. and Cole, D.J.A. Eds Butterworths, London 1990 pp 211227
Williams, P.E.V., Walker, A., MacRae, J.C. Rumen probiosis: The effects of addition of yeast culture (viable yeast [Sacchromyces cerevisiae] plus growth medium) on duodenal protein flow in wether sheep. Proceedings of the Nutrition Society 1990, 49, 128A.

Effects of yeast culture on rumen fermentation and liveweight gain in bulls fed isonitrogenous diets of barley/urea or barley/soya

  • S.M. Elhassan (a1), R.J. Wallace (a1), C.J. Newbold (a1), X.B. Chen (a1), I.E. Edwards (a2) and J.H. Topps (a2)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed