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Body composition and performance of autumn-calving Holstein-Friesian dairy cows during lactation: velocity of ultrasound measurement

Published online by Cambridge University Press:  24 November 2017

W.E. Ivings
Affiliation:
A.F.R.C. Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
M.J. Gibb
Affiliation:
A.F.R.C. Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
M.S. Dhanoa
Affiliation:
A.F.R.C. Institute of Grassland and Environmental Research, Hurley, Maidenhead, Berkshire SL6 5LR
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Extract

Measurements of the velocity of ultrasound (VOS) through live animals have been shown to provide good estimates of the proportions of dissected fat and muscle in carcasses of beef cattle (Fursey, Miles, Page and Fisher, 1991). The use of this technique to measure more accurately the changes in body composition and energy content of the dairy cow over lactation would greatly assist in the interpretation of nutritional studies. Estimation of body reserves from live weight (LW) can be inaccurate due to changes in gut fill, tissue water contents and reproductive tissues, and condition scoring is highly subjective. The present study investigates the relationships of LW and VOS measurements at 3 sites with dissected fat and muscle in the half carcass and chemically determined fat and crude protein (CP) in the whole carcass and empty body.

Type
Dairy Cow Metabolism and Nutrition
Copyright
Copyright © The British Society of Animal Production 1992

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References

Fursey, G.A.J., Miles, C.A., Page, S.J. and Fisher, A.V. (1991). Speed of ultrasound in Hereford bulls and its correlation with carcass composition. Animal Production 52: 263 269.Google Scholar
Gibb, M.J., Ivings, W.E. and Sutton, J.D. (1992a). Body composition and performance of autumn-calving Holstein-Friesian dairy cows during lactation: Non-carcass component weights. Summaries BSAP Winter meeting.Google Scholar
Gibb, M.J., Ivings, W.E. and Sutton, J.D. (1992b). Body composition and performance of autumn-calving Holstein-Friesian dairy cows during lactation: Chemical composition of the body. Summaries BSAP Winter meeting.Google Scholar
Miles, C.A., Fursey, G.A.J. and York, R.W.R. (1984). New equipment for measuring speed of ultrasound and its application in the estimation of body composition in farm livestock. In In vivo measurements of body composition in meat animals (ed. Lister, D.), pp.93 105. Elselvier Applied Science Publishers, London.Google Scholar
Sutton, J.D., Aston, K., Beever, D.E. and Fisher, W.J. (1992). Body composition and performance of autumn-calving Holstein-Friesian dairy cows during lactation: Food intake, milk constituent output and live weight. Summaries BSAP Winter meeting.Google Scholar
Williams, D.R. and Bergström, P.L. (1980). Anatomical jointing, tissue separation and weight recording. EEC standard method for beef. Commission of the European Communities EUR 6878 EN (Mimeograph).Google Scholar

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Body composition and performance of autumn-calving Holstein-Friesian dairy cows during lactation: velocity of ultrasound measurement
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