Page 9 - Leafland Simmental Catalogue ebook

EBV’s EXPLAINED

Calving Ease EBVs (%) are based on calving difficulty scores, birth weights and gestation length
information. More positive EBVs are favourable and indicate easier calving.
- CE % Dir = Direct Calving Ease - The EBV for direct calving ease indicates the influence of
the sire on calving ease in purebred females calving at two years of age.
- CE % Daughters = Daughters’ Calving Ease - The EBV for daughters’ calving ease
indicates how easily that sire’s daughters will calve at two years of age.
Birth Weight – Estimates the bull’s genetic contribution to the birth weight of his calves. The
lower the value the lighter the calf at birth and the lower the likelihood of a difficult birth and
more live calves. Important when selecting sires for use over heifers.
200 Day Growth – Growth potential of calf from birth to weaning.
400 Day Weight – Growth potential of calf to yearling weight.

600 Day Weight – Growth potential beyond yearling weight.
200 Day Milk – The sires genetic influence on his daughters milk producing ability. Important as
this will influence their calves 200 day growth. No Milk no Beef.
SS Scrotal Size – Indicator of male fertility in regards to semen quality and quantity. Higher
(positive) EBV’s indicate higher fertility. SS is also positively associated with female fertility.
CWT – Estimates the genetic difference in carcase weight in kilograms at 650 days. The more +
the figure the heavier the carcase at 20 months.
EMA – Eye Muscle Area (in square centimetres) on the live animal. More positive EBV’s
indicate better muscling on animals.
Rib and Rump Fat – Estimates fat depth using ultrasound. More fat indicates early maturity.

RBY% – Retail Beef Yield% represents total (boned out) meat yield as a % of a 300kg carcase.
A more + EBV indicates a higher % yield for the 300kg carcase.

INDEXES
UNDERSTANDING THE INDEXES: Maternal Terminal
Index values are provided for each bull. These allow the +83 +43
expected profitability of the progency of different bulls to
be compared.
The Maternal Index compares sires on the basis that a proportion of their female
progency will be retained in the herd as breeding replacements.
The Terminal Index compares sires on the basis that all progency will be finished for
slaughter (no females retained for breeding).

2021 GROUP BREEDPLAN AVERAGE EBV’S FOR 2019 BORN CALVES

DIR DTRS BW 200D 400D 600D MILK SS CWT EMA RIB RUMP RBY
+2.3 +1.2 +0.7 +20 +36 +45 +8 +0.5 +25 +2.5 +0.4 +0.2 +0.5
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