Changes in First Lactation Dairy Herd Improvement Records

Genotype and Variability in Dairy Lactation Records.

1999 Dairy Herd Improvement Herds in Arkansas

Successful dairy producers must have accurate and reliable records to make sound management decisions. The Dairy Herd Improvement (DHI) program provides a comprehensive herd analysis and management report that includes information concerning production, reproduction, genetics, herd health, animal and feed inventory, and finances. The data can be used to improve efficiency of milk production by ...

Duration of herd participation in dairy herd improvement milk recording in the United States.

Participation in milk-recording programs that provide data for national genetic evaluations of dairy cattle in the United States is voluntary, but the effectiveness of the evaluation system increases with the number of herds that contribute data. To investigate patterns of herd participation in Dairy Herd Improvement (DHI) testing, periods of continuous testing were computed based on the year t...

Changes in milk production in relation to changes in feeding and management practices in dairy herd improvement association herds.

All Holstein herds of over 20 cows which had automated data processed dairy herd improvement association (DHIA) records from Cornell laboratory for two consecutive years from 1960 to 1964 were used to determine production, feeding, and management changes. The average number of herds for the four 2-yr comparisons was 2,688, 60% in New York and the remainder in neighboring states. Results in the ...

Genetic covariances among relatives for dairy lactation records.