Hostname: page-component-8448b6f56d-t5pn6 Total loading time: 0 Render date: 2024-04-23T19:55:24.932Z Has data issue: false hasContentIssue false

Evaluation of the inclusion of estimators of body composition in models for the prediction of milk production by dairy cows

Published online by Cambridge University Press:  01 June 2009

Andrew J. Rook
Affiliation:
AFRC Institute of Grassland and Environmental Research, North Wyke, Okehampton EX20 2SB, UK
Malcolm J. Gibb
Affiliation:
AFRC Institute of Grassland and Environmental Research, North Wyke, Okehampton EX20 2SB, UK
Wendy E. Ivings
Affiliation:
AFRC Institute of Grassland and Environmental Research, North Wyke, Okehampton EX20 2SB, UK
Keith Aston
Affiliation:
AFRC Institute of Grassland and Environmental Research, North Wyke, Okehampton EX20 2SB, UK
John D. Sutton
Affiliation:
AFRC Institute of Grassland and Environmental Research, North Wyke, Okehampton EX20 2SB, UK

Abstract

Image of the first page of this content. For PDF version, please use the ‘Save PDF’ preceeding this image.'
Type
Short Communications
Copyright
Copyright © Proprietors of Journal of Dairy Research 1994

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Flatt, W. P. 1966 Energy metabolism results with lactating dairy cows. Journal of Dairy Science 49 230237CrossRefGoogle Scholar
Flatt, W. P., Moe, P. W., Munson, A. W. & Cooper, T. 1969 Energy utilization by high producing dairy cows. II. Summary of energy balance experiments with lactating Holstein–Friesian cows. In Energy Metabolism of Farm Animals (4th symposium, 1967), pp. 235251 (Eds Blaxter, K. L., Kielanowski, J. and Thorbek, G.). Newcastle-upon-Tyne: Oriel PressGoogle Scholar
Frood, M. J. & Croxton, D. 1978 The use of condition-scoring in dairy cows and its relationship with milk yield and live weight. Animal Production 27 285291Google Scholar
Garnsworthy, P. C. & Topps, J. H. 1982 The effect of body condition of dairy cows at calving on their food intake and performance when given complete diets. Animal Production 35 113119Google Scholar
Gibb, M. J. & Ivings, W. E. 1993 A note on the estimation of the body fat, protein and energy content of lactating Holstein–Friesian cows by measurement of body condition score and live weight. Animal Production 56 281283Google Scholar
Gibb, M. J., Ivings, W. E., Dhanoa, M. S. & Sutton, J. D. 1992 Changes in body components of autumn-calving Holstein–Friesian cows over the first 29 weeks of lactation. Animal Production 55 339360Google Scholar
Ivings, W. E., Gibb, M. J., Dhanoa, M. S. & Fisher, A. V. 1993 Relationships between velocity of ultrasound in live lactating dairy cows and some post-slaughter measurements of body composition. Animal Production 56 916Google Scholar
Miles, C. A., Fursey, G. A. J. & York, R. W. R. 1984 New equipment for measuring speed of ultrasound and its application in the estimation of body composition of farm livestock. In In Vivo Measurements of Body Composition in Meat Animals, pp. 93105 (Ed. Lister, D.). London: Elsevier Applied Science PublishersGoogle Scholar
Mulvaney, P. M. 1977 Dairy cow condition scoring. Shinfield, Reading: National Institute for Research in Dairying (Paper no. 4468)Google Scholar
Patterson, H. D. & Thompson, R. 1971 Recovery of inter-block information when block sizes are unequal. Biometrika 58 545554Google Scholar
Porter, S. J., Owen, M. G., Page, S. J. & Fisher, A. V. 1990 Comparison of seven ultrasonic techniques for in vivo estimation of beef carcass composition with special reference to performance testing. Animal Production 51 489495Google Scholar
Rook, A. J. 1991 Autoregressive models for the prediction of the constituents of milk in dairy cows. Animal Production 52 566567 (Abstr.)Google Scholar
Rook, A. J., Fisher, W. J. & Sutton, J. D. 1992 a Sources of variation in yields and concentrations of milk solids in dairy cows. Animal Production 54 169173Google Scholar
Rook, A. J., Sutton, J. D. & France, J. 1992 b Prediction of the yields of milk constituents in dairy cows offered silage ad-libitum and concentrates at a flat rate. Animal Production 54 313322Google Scholar
Simm, G. 1983 The use of ultrasound to predict the carcass composition of live cattle – a review. Animal Breeding Abstracts 51 853875Google Scholar
Sutton, J. D., Aston, K., Beever, D. E. & 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. Animal Production 54 473 (Abstr.)Google Scholar
Wright, I. A. & Russel, A. J. F. 1984 Estimation in vivo of the chemical composition of the bodies of mature cows. Animal Production 38 3344Google Scholar