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Test day model evaluations of production traits in the United Kingdom (UK)

Published online by Cambridge University Press:  20 November 2017

R. A. Mrode ,
G.J.T. Swanson  and
M. F. Paget
R. A. Mrode
Affiliation:
MDC Evaluations Ltd, Fox Talbot House, Greenways Business Park, Chippenham, Wiltshire, SN15 1BN. E-mail:, [email protected]
G.J.T. Swanson
Affiliation:
MDC Evaluations Ltd, Fox Talbot House, Greenways Business Park, Chippenham, Wiltshire, SN15 1BN. E-mail:, [email protected]
M. F. Paget
Affiliation:
MDC Evaluations Ltd, Fox Talbot House, Greenways Business Park, Chippenham, Wiltshire, SN15 1BN. E-mail:, [email protected]
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Extract

The test day model (TDM) has become the method of choice for genetic evaluation of production traits in dairy cattle. However, in the UK, complete test day (TD) records are only available from 1995 compared with 305d yields utilised in the current animal model (IAM) dating back to 1975. The analysis of TD records only would significantly reduce accuracy of evaluations through limited data including loss of dam information on cows with records prior to 1995. An optimum solution would be the joint analysis of TD and 305d records. This paper presents a TDM used for the joint analysis of TD and lactation records in the UK and results from its application to the Holstein Friesian (HOL), Jersey (JER) and Guernsey (GUE) breeds.

Type
Theatre Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2004 , 2004 , pp. 25
Copyright
Copyright © The British Society of Animal Science 2004

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References

Lidauer, M.I., Strandėn, I., and Mäntysaari, E., 1999. Mixed Model Equation Solver. Mix99 Manual. Animal Production Research, Jokioinen, Finland.Google Scholar
Mrode, R.A., Swanson, G.J.T., and Paget, M.F., 2003. Implementation of a Test Day Model for Production Traits in the UK. Proceedings of Interbull Meeting, Rome. 193–196.Google Scholar