Page 13 - Tarangower Angus Catalogue ebook

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