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

Published online by Cambridge University Press:  24 November 2017

S.M. Elhassan ,
R.J. Wallace ,
C.J. Newbold ,
X.B. Chen ,
I.E. Edwards  and
J.H. Topps
S.M. Elhassan
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
R.J. Wallace
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
C.J. Newbold
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
X.B. Chen
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
I.E. Edwards
Affiliation:
School of Agriculture, 581 King Street, Aberdeen, AB9 1UD
J.H. Topps
Affiliation:
School of Agriculture, 581 King Street, Aberdeen, AB9 1UD
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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 Rumen fluid samples were withdrawn by stomach tube 5 and 10 weeks after the beginning of the trial.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).

Type
Rumen Metabolism
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1992 , March 1992 , pp. 211
Copyright
Copyright © The British Society of Animal Production 1992

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References

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, 131–142.CrossRefGoogle ScholarPubMed
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