http://www.cnr.it/ontology/cnr/individuo/prodotto/ID10891
Genetic analysis of defective type characteristics and their genetic relationships with herd life of Canadian Holsteins (Articolo in rivista)
- Type
- Label
- Genetic analysis of defective type characteristics and their genetic relationships with herd life of Canadian Holsteins (Articolo in rivista) (literal)
- Anno
- 2002-01-01T00:00:00+01:00 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Wang Y., Stella A., Boettcher P.J. (literal)
- Pagina inizio
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Titolo
- Genetic analysis of defective type characteristics and their genetic relationships with herd life of Canadian Holsteins (literal)
- Abstract
- Heritabilities were estimated for 39 defective type characteristics of
Canadian Holsteins. Approximately 100,000 records were available for
analysis. Because these defects were scored into three categories (normal,
minor, and serious), heritabilities were estimated using a threshold sire
model with Gibbs sampling for numerical integration. Many of the traits
had moderate (>0.20) heritabilities on the underlying scale, but
heritabilities were much lower when transformed to the observed scale
(none exceeding 0.09). Genetic evaluation was performed for each of the
defects and genetic correlations of the defects with longevity were
approximated by adjusting the product-moment correlations of ETA for the
defects with ETA for herd life. The defective characteristics associated
with the udder were the most strongly related to herd life. In general,
the defective characteristics with the highest incidence rates also showed
the greatest genetic relationships with herd life. Although some of the
defective characteristics were moderately correlated with herd life, they
generally have low incidence rates and are therefore not expected be of
high economic importance themselves. Effects on herd life of the most
important defects are already considered indirectly in the evaluation
through their contributions to the type traits that are used to official
ratings of sires for herd life. For these reasons a routine genetic
evaluation of the defects seems unwarranted. (literal)
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