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Breedplan

Useful Information

BREEDPLAN the numbers explained
Useful Information » Breedplan
BREEDPLAN is a modern genetic evaluation system for beef cattle. It offers the
potential to accelerate genetic improvement in your herd, tighten up breeding
operations, improve productivity and increase prices of cattle sold for both breeding
and slaughter. At the time of printing this catalogue, the Aberdeen Angus, Simmental,
Shorthorn, Belgian Blue and Hereford breeds are using this system.
 
CALVING EASE
Calving Ease EBVs are based on calving difficulty scores, birth weights and gestation length information. More
positive EBVs are favourable and indicate easier calving. DIRECT calving ease indicates how this animal influences
the birth of his progeny.
DAUGHTERS’ calving ease indicates how well the animal produces daughters that have easier calving.
 
BIRTH
GL: Gestation length EBV (days) is based on AI records. Lower (negative) GL EBVs indicate shorter gestation
lengths which generally relate to easier calving and increased growth after birth.
BWT: Birth Weight EBV (kg) is based on the measured birth weight of animals, adjusted for damage. The lower the
value the lighter the calf at birth and the less is the likelihood of a difficult birth. This is particularly important
when selecting sires for use on heifers.
 
GROWTH
MILK: 200 Day Milk EBV (kg) is an estimate of an animal’s milking ability. For sires, this EBV is indicative of
their daughters’ milking ability as it affects the 200 Day Weight of their calves.
200: 200 Day Growth EBV (kg) is calculated from the weight of animals taken between 80 and 300 days of age.
Values are adjusted to 200 days and for dam age. This EBV is the best single estimate of an animal’s genetic
merit for growth to early ages.
400: 400 Day Weight EBV (kg) is calculated from the weight of progeny taken between 301 and 500 days of
age, adjusted to 400 days and for dam age. This EBV is the best single estimate of an animal’s genetic merit for
yearling weight.
600: 600 Day Weight EBV (kg) is calculated from the weight of progeny taken between 501 and 900 days of
age, adjusted to 600 days and for dam age. This EBV is the best single estimate of an animal’s genetic merit for
growth beyond yearling age.
 
Carcass
CWT: Carcass Weight EBV (kg) is an estimate of the genetic difference in Carcass weight at a standard age of
650 days.
EMA: Eye Muscle Area EBV (cm2) estimates genetic differences in eye muscle area of a 300 kg dressed Carcass.
More positive EBVs indicate better muscling on animals.
RIB: Rib Fat EBV (mm) estimates the genetic differences in fat depth at the rib in a 300 kg dressed Carcass. More
positive EBVs indicate more subcutaneous fat and earlier maturity.
RBY%: Retail Beef Yield Percent EBV (%) represents total (boned out) meat yield as a percentage of a 300 kg
dressed Carcass. A more positive EBV indicates higher percentage yield for the 300 kg Carcass size.
 
TERMINAL SIRE INDEX
This index ranks bulls by their genetic potential for the production of prime steers and heifers for beef production.
Growth and Carcass EBVs are the main drivers used in compiling this index, with considerable emphasis on calving
ease direct. Typical production parameters, prices and costs underlie this selection index. Bulls with a higher
Terminal Index will have a greater genetic potential to sire heavier finished progeny.
As there are no maternal traits included in the calculation of the Terminal Index, bulls with a high Index will not
necessarily be suitable for breeding heifer replacements.
 
SELF REPLACING INDEX
This index is also focused on Calving Ease, Retail Beef Yield and Growth (as animals are still being sold for
slaughter), but includes maternal and fertility EBVs as well. The index is trying to balance the requirements
for the cow herd with producing animals to market specifications. The Self Replacing Index is aimed at a herd
selecting replacement females from within the herd while breeding steers and excess heifers to turn off to meet
market specifications. There is emphasis on calving ease and maternal traits while also looking to finish animals
for slaughter.
Eurogene AI Services (Ireland) Ltd.
Carrigeen Industrial Estate, Cahir,
Co. Tipperary
Tel: 052 74 42940 Fax: 052 74 45731
Need more information? You can get in Contact with us here.