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Multi-trait covariance functions to estimate genetic correlations between milk yield, dry-matter intake and live weight during lactation

Published online by Cambridge University Press:  27 February 2018

R. F. Veerkamp  and
R. Thompson
R. F. Veerkamp
Affiliation:
DLO-Institute for Animal Science and Health, P.O. Box 65, 8200 AB Lelystad, The Netherlands
R. Thompson
Affiliation:
IACR Statistics Department, IACR-Rothamsted, Harpenden, Hertfordshire AL5 2JQ
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Abstract

Energy balance is a function of dry-matter intake (DMI), live weight and milk yield over a certain time period. To investigate potential strategies to use genetic selection for the improvement of the negative energy balance, genetic co-variances were estimated among DMI, live weight and milk yield during the first 15 weeks of lactation (no.=628). Rather than estimating the full 45 by 45 matrix a random regression model was used to estimate a second order covariance functions for the additive genetic and permanent environmental effects. Fixed effects were test-day, a group effect and week in lactation. Estimates for the genetic covariance function demonstrated that a high level of milk yield is only moderately correlated with a high level of DMI (0.21) but very strongly correlated to an increase of intake (0.97) and a loss of live weight (-0.46) during the first 15 weeks of lactation. Levels of weight and intake were correlated strongly (0.81). Estimates for the genetic correlations between weeks 1 and 15 were 0.79, 0.34 and 0.83 for milk yield, DMI and live weight respectively. DMI during early lactation was negatively correlated with milk yield but DMI during the later weeks was positively correlated with milk yield. The implication is that when selection is for a linear combination of milk yield, DMI and live weight (i.e. energy balance or efficiency) the moment in lactation of measuring each trait on the cow is of importance

Type
Research Article
Information
BSAP Occasional Publication , Volume 24: Metabolic stress in dairy cows , 1999 , pp. 147 - 151
Copyright
Copyright © British Society of Animal Science 1999

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