Page 10 - Pukenui 2020
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indicate easier calving.                                600-Day Weight EBV (kg) is calculated from the weight of progeny taken
      CE % Direct = Direct Calving Ease - The EBV for direct calving ease   between 501 and 900 days of age, adjusted to 600 days and for age of
      indicates the influence of the sire on calving ease in purebred females   dam.  This EBV is the best single estimate of an animal’s genetic merit for
      calving at two years of age.                            growth beyond yearling age.
      CE % Daughters = Daughters’ Calving Ease - The EBV for daughters’   Mature Cow Weight EBV (kg) is based on the cow weight when the
      calving ease indicates how easily that sire’s daughters will calve at two   calf is weighed for weaning, adjusted to 5 years of age.  This EBV is an
      years of age.                                           estimate of the genetic difference in cow weight at 5 years of age and
                                                              is an indicator of growth at later ages and potential feed maintenance
      Gestation Length EBV (days) is an estimate of the time from conception   requirements of the females in the breeding herd.  Steer breeders
      to the birth of the calf and is based on AI and hand mating records.    wishing to grow animals out to a larger weight may also use the Mature
      Lower (negative) GL EBVs indicate shorter gestation length and therefore   Cow Weight EBV.
      easier calving and increased growth after birth.
      Birth Weight EBV (kg) is based on the measured birth weight of progeny,   Milk EBV (kg) is an estimate of an animal’s milking ability.  For sires, this
                                                              EBV indicates the effect of the daughter’s milking ability, inherited from
      adjusted for dam age.  The lower the value, the lighter the calf at birth and   the sire, on the 200-day weights of her calves.  For dams, it indicates her
      the lower the likelihood of a difficult birth.  This is particularly important   milking ability.
      when selecting sires for use over heifers.
      200-Day Growth EBV (kg) is calculated from the weight of progeny taken   Scrotal Size EBV (cm) is calculated from the circumference of the
                                                              scrotum taken between 300 and 700 days of age and adjusted to 400
      between 80 and 300 days of age.  Values are adjusted to 200 days and   days of age.  This EBV is an estimate of an animal’s genetic merit for
      for age of dam.  This EBV is the best single estimate of an animal’s genetic   scrotal size.  There is also a small negative correlation with age of puberty
      merit for growth to early ages.                         in female progeny and therefore selection for increased scrotal size will
      400-Day Weight EBV (kg) is calculated from the weight of progeny taken   result in reduced age at calving of female progeny.
      between 301 and 500 days of age, adjusted to 400 days and for age of   Days to Calving EBV (days) indicates the fertility of the daughters of
      dam.  This EBV is the best single estimate of an animal’s genetic merit for   the sire.  It is the time interval between the day when the female is first
      yearling weight.                                        exposed to a bull in a paddock mating to the day when she subsequently

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