Page 6 - Tawanui, Aywon, Te Kupe Sale 2021 ebook

CALVING EASE EBVS (%) are based on calving difficulty scores, birth dam. This EBV is the best single estimate of an animal’s genetic merit for
weights and gestation length information. More positive EBVs are yearling weight.
favourable and 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 to requirements of the females in the breeding herd. Steer breeders wishing
the birth of the calf and is based on AI and hand mating records. Lower to grow animals out to a larger weight may also use the Mature Cow
(negative) GL EBVs indicate shorter gestation length and therefore easier Weight EBV.
calving and increased growth after birth.
Milk EBV (kg) is an estimate of an animal’s milking ability. For sires, this
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 EBV indicates the effect of the daughter’s milking ability, inherited from
the lower the likelihood of a difficult birth. This is particularly important the sire, on the 200-day weights of her calves. For dams, it indicates her
when selecting sires for use over heifers. milking ability.
Scrotal Size EBV (cm) is calculated from the circumference of the scrotum
200-Day Growth EBV (kg) is calculated from the weight of progeny taken
between 80 and 300 days of age. Values are adjusted to 200 days and for taken between 300 and 700 days of age and adjusted to 400 days of age.
age of dam. This EBV is the best single estimate of an animal’s genetic This EBV is an estimate of an animal’s genetic merit for scrotal size. There
merit for growth to early ages. 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
400-Day Weight EBV (kg) is calculated from the weight of progeny taken at calving of female progeny.
between 301 and 500 days of age, adjusted to 400 days and for age of
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