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Milk production and N partitioning in early lactation dairy cows offered perennial ryegrass containing a high concentration of water soluble carbohydrates

Published online by Cambridge University Press:  20 November 2017

J. M. Moorby ,
L. A. Miller ,
R. T. Evans ,
N. D. Scollan ,
M. K. Theodorou  and
J. C. MacRae
J. M. Moorby
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, UK
L. A. Miller
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, UK Institute of Rural Studies, Llanbadarn, University of Wales, Aberystwyth SY23 4AL, UK
R. T. Evans
Affiliation:
Institute of Grassland and Environmental Research, Trawsgoed Farm, Trawsgoed, Aberystwyth SY23 4LL, UK
N. D. Scollan
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, UK
M. K. Theodorou
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, UK
J. C. MacRae
Affiliation:
Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen, AB21 9SB, UK
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Extract

The efficiency of utilisation of grass nitrogen for milk protein production tends to be low, because rumen fermentable energy sources limit the amount of diet amino acids that are incorporated into microbial protein. As a consequence, absorption of ammonia from the rumen and excretion of high-N waste products is considerable. Previous studies (Miller et al., 1999) have shown that the efficiency of use of feed N can be increased in late-lactation dairy cows by feeding ryegrass bred to contain a high concentration of water soluble carbohydrates (WSC). The objective of this study was to investigate milk production and N partitioning in early lactation dairy cows using the same high WSC ryegrass variety, AberDove.

Type
Threatre Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2001 , 2001 , pp. 6
Copyright
Copyright © The British Society of Animal Science 2001

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References

Miller, L.A., Theodorou, M.K., MacRae, J.C., Evans, R.T., Adesogan, A.T., Humphreys, M.O., Scollan, N.D. and Moorby, J.M. 1999. Milk production and N partitioning responses in dairy cows offered perennial ryegrass selected for high water soluble carbohydrate concentrations. South African Journal of Animal Science 29 (ISRP): 321–322.Google Scholar