Impact of maturity rate of daughters on genetic ranking of Holstein bulls.

  title={Impact of maturity rate of daughters on genetic ranking of Holstein bulls.},
  author={HansenJ. Norman and James R. Wright and Richard Llewellyn Powell and Paul M. Vanraden},
  journal={Journal of dairy science},
  volume={88 9},
If genetic evaluations are calculated with a single-trait repeatability model, evaluation changes may be attributed in part to bulls that have daughters that deviate considerably from the typical response to aging. Differences in maturity rate of bull daughters were examined to determine whether they influence change in bull evaluations. Standardized milk records for Holsteins that first calved between 1960 and 1998 were used to calculate 12 tailored predicted transmitting abilities (PTA) for… CONTINUE READING

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