Page 12 - Turihaua 2021 Bull Catalogue

DEFINITION OF CALVING EASE EBVs
CALVING EASE DIRECT
Calving Ease (DIR) EBV’s are estimates of genetic differences in the ability of a sire’s
calves to be born unassisted from 2 year old heifers. The EBV’s are reported as
differences in the percentage of unassisted calvings.
Higher, more positive, Calving Ease (DIR) EBV’s are more favourable
CALVING EASE DAUGHTERS
Calving Ease (DTRS) EBV’s are estimates of genetic differnces in the ability of a
sire’s 2 year old daughters to calve without assistance. The EBV’s are reported as
differences in the percentage of unassisted calvings.
Higher, more positive, Calving Ease (DIR) EBV’s are more favourable
GESTATION LENGTH (DAYS):
This is an estimate of the time from conception to the birth of the calf and is based
on AI records. Lower (negative) GL EBVs indicate shorter gestation length and
therefore easier calving and increased growth after birth.

DEFINITION OF FERTILITY EBVs
DAYS TO CALVING (DAYS):
This EBV indicates the fertility of the daughters of the sire. It is the time interval
between the date 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.

SCROTAL SIZE EBV (CM):
This is calculated from the circumference of the scrotum, measured in centimetres
and adjusted to 400 days of age. This EBV is an estimate of a sire’s genetic merit for
scrotal size and is positively correlated to age of puberty in female progeny.

AVERAGE GROUP EBVS FOR THE 2019 BORN CALVES ANALYSED IN THE MAY
2021 AUSTRALASIAN ANGUS GROUP BREEDPLAN

CE
GESTATION BIRTH 200-DAY 400-DAY 600-DAY
Dir. Dtrs LENGTH WEIGHT GROWTH WEIGHT WEIGHT
+1.8 2.1 +4.4 +4.2 +46 +84 +110

MATURE 200-DAY SCROTAL DAYS TO CARCASE
EMA
WEIGHT MILK SIZE CALVE WEIGHT
+95 +16 +1.9 -4.2 +61 +5.4
RETAIL BEEF
RIB FAT RUMP FAT IMF%
YIELD
+0.1 -0.2 +0.4 +1.8

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