Document Detail


Relationships of first lactation yields with lifetime performance traits in Holstein cows.
MedLine Citation:
PMID:  21395725     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Genetic and phenotypic correlations between the first lactation and lifetime yields of milk, fat and protein, herdlife, productive life and number of lactations initiated in the herd were estimated from records of 24,231 progeny of 234 young and 119 proven Holstein sires in 1791 herds using a multivariate REML technique to fit a sire model with relationships among young sires. Proven sires were fitted as fixed effects. Genetic correlations between first lactation and lifetime yields were highest for milk (0.666) followed by fat (0.660) and protein (0.512). Genetic as well as phenotypic correlations of herdlife, productive life and number of lactations were higher with first lactation milk yield than with first lactation fat and protein yields. Direct selection for higher lifetime yields would not be effective because of low heritabilities. However the high, positive genetic correlations of lifetime yields of milk and fat with first lactation yields suggested that first lactation yields might be used for indirect selection for higher lifetime yields. ZUSAMMENFASSUNG: Beziehung zwischen Erstlaktations- und Lebensleistung bei Holstein-Kühen Zwischen Erstlaktations- und Lebensleistung für Milch, Fett, Protein, Verbleibedauer, produktiver Lebensdauer und Zahl von Laktationen in der Herde wurden von 24.291 Töchtern, 234 Jung- und 119 geprüften Holsteintieren in 1.791 Herden genetische Beziehungen geschätzt, wobei eine multivariate REML-Technik zur Analyse eines Stiermodells mit Verwandtschaft zwischen jungen Stieren angewendet worden ist. Die geprüften Stiere wurden als fixe Effekte angesehen. Genetische Korrelationen zwischen Erstlaktation und Lebensleistung war am höchsten für Milch (0,666), gefolgt von Fett (0,660) und Protein (0,512). Genetische und phänotypische Korrelationen mit Verbleibedauer, produktiver Lebensdauer und Zahl der Laktationen waren ebenfalls für Erstlaktations-milchmenge höher als bei Fett und Protein. Direkte Selektion auf höhere Lebensleistung würde wegen der niedrigen Heritabilität nicht wirksam sein. Allerdings könnten die hohen positiven genetischen Korrelationen des Merkmals mit Erstlaktationsleistungen diese als geeignetes indirektes Selektionskriterium für höhere Lebensleistung anzeigen.
Authors:
V P Chauhan; J F Hayes
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie     Volume:  110     ISSN:  0931-2668     ISO Abbreviation:  J. Anim. Breed. Genet.     Publication Date:  1993 Jan 
Date Detail:
Created Date:  2011-03-14     Completed Date:  2012-10-02     Revised Date:  2013-05-20    
Medline Journal Info:
Nlm Unique ID:  100955807     Medline TA:  J Anim Breed Genet     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  264-7     Citation Subset:  -    
Copyright Information:
1993 Blackwell Verlag GmbH.
Affiliation:
Macdonald College of McGill University, Canada.
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