Genetic and Environmental Influences on Milk and Milk Component Production

G. L. Hargrove, D. A. Mbah, J. L. Rosenberger

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Estimates of genetic parameters and environmental correlations were from deviations from modified contemporary average of standardized records of first lactations of Holsteins in Pennsylvania. Records were extended to 305 days and adjusted for month of calving prior to calculation of deviations. Heritabilities from intrasire correlations among paternal sisters were .23, .26, .22, .71, and .64 for yields of milk, fat, and protein, and percentages of fat and protein. Genetic correlations were positive and generally high between yields and between percentages. Correlations of milk yield with percentages were strongly negative. Environmental correlations among paternal sisters in the same herd were .08, .11, .10, −.04, and −.03 for yields of milk, fat, protein, and percentages of fat and protein. These statistics will be useful to plan optimum selection programs and to improve sire evaluation procedures, particularly for protein content and yield.

Original languageEnglish (US)
Pages (from-to)1593-1597
Number of pages5
JournalJournal of dairy science
Volume64
Issue number7
DOIs
StatePublished - Jan 1 1981

All Science Journal Classification (ASJC) codes

  • Food Science
  • Animal Science and Zoology
  • Genetics

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