Estimates using an animal model of (co)variances for yields of milk, fat, and protein for the first lactation of Holstein cows in California and New York.

Abstract excerpt

First lactation yields of milk, fat, and protein from Holstein cows in New York and California were used to obtain REML estimates of (co)variances for yield traits using a multitrait animal model. Data from each state were split randomly into 10 samples, averaging 5504 cows per sample from California and 5078 from New York. Mean heritability estimates for milk, fat, and protein yields were .30 +/- .02, .31 +/-...

Topics

• Animals
• California
• Cattle
• Environment
• Female
• Genetic Variation
• Lactation
• Lipid Metabolism
• Milk
• Milk Proteins
• Models, Biological
• New York