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Partial replacement of soyabean meal and rapeseed meal with a slow release urea source (Optigen® II) and its effect on microbial growth and metabolism in vitro

Published online by Cambridge University Press:  23 November 2017

L.A. Sinclair ,
J.A. Huntington  and
D. Wilde
L.A. Sinclair*
Affiliation:
Harper Adams University College, Edgmond, Newport, Shropshire, TF10 8NB, United Kingdom
J.A. Huntington
Affiliation:
Harper Adams University College, Edgmond, Newport, Shropshire, TF10 8NB, United Kingdom
D. Wilde
Affiliation:
Alltech (UK) Ltd., Alltech House, Ryhall Road, Stamford, Lincs., United Kingdom
*
Email:lsinclair@harper-adams.ac.uk
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Extract

Sources of non protein nitrogen (NPN) are attractive because of their low cost relative to vegetable proteins. Urea is the most commonly used NPN source and is rapidly hydrolysed to ammonia within the rumen. A very rapid release of ammonia may result in reduced utilisation by ruminal bacteria, increased N excretion, negative impacts on fertility and potentially ammonia toxicity (Richardson et al., 2003). This has lead to the development of slow-release urea based products including isobutylidene diurea, acetylurea, biuret and formaldehyde treated urea. Recently a blended fat and urea source (Optigen®) has been shown to reduce the rate of ammonia release in the rumen, but its effects on microbial metabolism are unclear. The objectives of the current study were to evaluate the effects of a slow release urea source (Optigen®) as a partial replacement for soyabean and rapeseed meal on microbial growth and metabolism in vitro.

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Proceedings of the British Society of Animal Science , Volume 2008 , 2008 , pp. 224
Copyright
Copyright © The British Society of Animal Science 2008

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References

Sinclair, L. A., Bond, A. J., Huntington, J.A., and Readman, R.J. (2007). Effect of rate of substitution of processed, urea-treated whole crop wheat for grass silage on the intake, milk production and diet digestibility in dairy cows and ruminal metabolism in vitro . Animal 2008: 601–611.Google Scholar
Richardson, J.M., Wilkinson, R.G. and Sinclair, L.A. (2003). Synchrony of nutrient supply to the rumen and dietary energy source and their effects on the growth and metabolism of lambs. J. Anim. Sci. 81: 1332–1347.Google Scholar