Official lactation records received in 1973, by State; Summary of Official lactation records reported since 1957; Records reported but not used in genetic evaluation 1973; Sire identification in Official lactation records, 1969-1973, by State; Summary of the use of Offical records for bull and cow evaluation; Percentage of cows with sire identification
King, G.J.; Randall, L.F.
Dairy Herd Improvement Letter 50(2): 8
1974
Document Number: 236841
In 1973, the number of Official DHI and DHIR lactation records reported to the USDA for sire evaluation was 2 417 721, an increase of 274 462 records on the 1972 figure. The reasons for rejecting 47.14% of the records submitted are analysed.