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Fit of different functions to the individual deviations in random regression test day models for milk yield in dairy cattle


Fit of different functions to the individual deviations in random regression test day models for milk yield in dairy cattle



Italian Journal of Animal Science 6(Suppl 1): 153-155



ISSN/ISBN: 1594-4077

The shape of individual deviations of milk yield for dairy cattle from the fixed part of a random regression test day model (RRTDM) was investigated. Data were 53,217 TD records for milk yield of 6,229 first lactation Canadian Holsteins in Ontario. Data were fitted with a model that included the fixed effects of herd-testdate, DIM interval nested within age and season of calving.

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