Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 407975
Title Effects of different simplified milk recording methods on genetic evaluation with test-day animal model
Author(s) Portolano, B.; Maizon, D.O.; Riggio, V.; Tolone, M.; Cacioppo, D.
Source Italian Journal of Animal Science 6 (2007)1. - ISSN 1594-4077 - p. 195 - 197.
Department(s) Animal Breeding and Genetics
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) random regression-models - splines
Abstract The aims of the present study were to compare estimated breeding values (EBV) for milk yield using different testing schemes with a test-day animal model and to evaluate the effect of different testing schemes on the ranking of top sheep. Alternative recording schemes that use less information than that currently obtained with a monthly test-day schedule were employed to estimate breeding values. A random regression animal mixed model that used a spline function of days in milk was fitted. EBVs obtained with alternative recording schemes showed different degrees of Spearman correlation with EBVs obtained using the monthly recording scheme. These correlations ranged from 0.77 to 0.92. A reduction in accuracy and intensity of selection could be anticipated if these alternative schemes are used; more research in this area is needed to reduce the costs of test-day recording.
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