Page 6 - Ranui Angus Sale Catalogue eBook
P. 6

CE % Direct = Direct Calving Ease - The EBV for direct calving ease
      indicates the influence of the sire on calving ease in purebred females
      calving at two years of age.
      CE % Daughters = Daughters’ Calving Ease - The EBV for daughters’
      calving ease indicates how easily that sire’s daughters will calve at
      two years of age.
      Gestation Length EBV (days) is an estimate of the time from
      conception to the birth of the calf and is based on AI and hand mating
      records.  Lower (negative) GL EBVs indicate shorter gestation length
      and therefore easier calving and increased growth after birth.
      Birth Weight EBV (kg) is based on the measured birth weight of
      progeny, adjusted for dam age.  The lower the value, the lighter the
      calf at birth and the lower the likelihood of a difficult birth.  This is
      particularly important when selecting sires for use over heifers.
      400-Day Weight EBV (kg) is calculated from the weight of progeny
      taken between 301 and 500 days of age, adjusted to 400 days and
      for age of dam.  This EBV is the best single estimate of an animal’s
      genetic merit for yearling weight.
      600-Day Weight EBV (kg) is calculated from the weight of progeny
      taken between 501 and 900 days of age, adjusted to 600 days and
      for age of dam.  This EBV is the best single estimate of an animal’s
      genetic merit for growth beyond yearling age.
      Mature Cow Weight EBV (kg) is based on the cow weight when the
      calf is weighed for weaning, adjusted to 5 years of age.  This EBV
      is an 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 requirements of the females in the breeding herd.  Steer
      breeders wishing to grow animals out to a larger weight may also
      use the Mature Cow Weight EBV.
      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 the sire, on the 200-day weights of her calves.  For
      dams, it indicates her milking ability.
      Scrotal Size EBV (cm) is calculated from the circumference of the
      scrotum taken between 300 and 700 days of age and adjusted to 400
      days of age.  This EBV is an estimate of an animal’s genetic merit
      for scrotal size.  There is also a small negative correlation with age
      of puberty in female progeny and therefore selection for increased
      scrotal size will result in reduced age at calving of female progeny.
      Days to Calving EBV (days) indicates the fertility of the daughters
      of the sire.  It is the time interval between the day when the female
      is first exposed to a bull in a paddock mating to the day when she
      subsequently calves.  A negative EBV for days to calving indicates
      a shorter interval from bull-in date to calving and therefore higher
      fertility.
      Carcase Weight EBV (kg) is based on abattoir carcase records and
      is  an  indicator  of  the  genetic  differences  in  carcase  weight  at  the
      standard age of 750 days.

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