Page 12 - Turiroa Angus Sale 2021 ebook

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