Relationships Between Type and Performance of Daughters of Artificial Insemination Sires

Progeny group means of Predicted Difference milk yield, Predicted Difference fat yield, per cent of daughters with incomplete first lactations, and Descriptive Type were studied for 417 Holstein active artificial insemination (AI) sires which were production summarized in 1969-70. Three multiple regression analyses were: (1) regression of percent incomplete first lactations on Predicted Difference milk, Predicted Difference fat, and Descriptive Type; (2) regression of Predicted Difference milk on Descriptive Type, and (3) regression of per cent of sire's daughters exceeding breed-age average on Descriptive Type.