Genetic parameters for first milk production and composition traits for Holsteins using multivariate restricted maximum likelihood.

Abstract excerpt

Heritabilities and genetic and phenotypic correlations among yields of milk, fat, protein, and percentages of fat and protein were estimated from 40,984 first lactation records of daughters of 488 young and 75 proven Holstein sires using multivariate REML and a sire model accounting for relationships and sire groups. Proven sires were treated as fixed effects. Heritabilities for yields of milk, fat, protein, and...

Topics

• Animals
• Breeding
• Cattle
• Female
• Lactation
• Lipids
• Milk
• Milk Proteins
• Models, Genetic
• Multivariate Analysis
• Phenotype
• Regression Analysis