Heifer fertility in Norwegian dairy cattle: variance components and genetic change.

doi:10.3168/jds.S0022-0302(03)73866-1

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Article

Heifer fertility in Norwegian dairy cattle: variance components and genetic change.

Journal of dairy science - 1 Aug 2003

A-Ranberg I M, Heringstad B, Klemetsdal G, Svendsen M, Steine T

Abstract excerpt

Variance components and genetic change were estimated for 56-d nonreturn rate in virgin heifers using first insemination records of a total of 1,632,961 Norwegian Dairy Cattle daughters of 2945 sires. Six univariate mixed linear sire models were compared. The heritabilities varied from 1.2% to 1.4%. All models gave favorable, although different, estimates of genetic change of 56-d nonreturn rate. The method used...

Topics

Animals
Breeding
Cattle
Female
Fertility
Genetic Variation
Lactation
Linear Models
Models, Genetic
Norway
Predictive Value of Tests

Source

Open in PubMed

Identifiers

PMID: 12939095
DOI: 10.3168/jds.S0022-0302(03)73866-1

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