6533b836fe1ef96bd12a0ab2
RESEARCH PRODUCT
Effects of different simplified milk recording methods on genetic evaluation with Test-Day animal model
D. CacioppoBaldassare PortolanoMarco ToloneD. O. MaizonValentina Riggiosubject
Mixed modelSchedulerecording schemesTest-Days Genetic Evaluation Recording SchemesAnimal Breeding and GenomicsSpearman's rank correlation coefficientgenetic evaluationSettore AGR/17 - Zootecnica Generale E Miglioramento Geneticorandom regression-modelsAnimal modelRankingTest dayRandom regressionStatisticsWIASsplinesFokkerij en GenomicaAnimal Science and Zoologylcsh:Animal culturetest-daysSelection (genetic algorithm)lcsh:SF1-1100Mathematicsdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-01-01 | Italian Journal of Animal Science |