Page 8 - Kairuru Herefords Catalogue ebook

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