Page 8 - Orari Gorge 2021 Catalogue ebook
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UNDERSTANDING ESTIMATED BREEDING VALUES (EBVS)
ESTIMATED BREEDING VALUES (EBVs): The EBV is the best estimate of an and is an indicator of growth at later ages and potential feed maintenance
animal’s genetic merit for that trait. requirements of the females in the breeding herd. Steer breeders wishing to
• DIR: Direct calving ease indicates how this animal influences the birth of grow animals out to a larger weight may also use the Mature Cow Weight
its progeny. More positive EBV’s are favourable and indicate easier calving. EBV.
• DTRS: Daughter’s calving ease indicates how well the animal produces • Carcase: CWT - Carcase Weight EBV (kg) estimates the genetic difference
daughters that have easier calving. More positive EBV’s are favourable and in carcase weight at a standard age of 650 days. More positive EBVs indicate
indicate easier calving. heavier carcases at 650 days of age.
• EMA: Eye Muscle Area EBV (CM2) estimates genetic differences in eye muscle
• BWT: Birth Weight EBV (kg) is based on the measured birth weight of animals,
area at the 12/13th rib site of a 300kg dressed carcase. More positive EBVs
adjusted for dam age. The lower the value the lighter the calf at birth and lower
indicate better muscling on animals.
the likelihood of a difficult birth. This is particularly important when selecting
sires for use over heifers. • RIB: Rib Fat EVB (mm) estimates the genetic differences in fat depth at the
12/13th rib in a 300kg dressed carcase. More positive EBVs indicate more
• 200: 200-day Growth EBV (kg) is calculated from the weight of animals taken
subcutaneous fat and earlier maturity.
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 • RUMP: Rump fat EBV (mm) estimates the genetic differences in fat depth
to early ages. at the P8 site on a 300kg dressed carcase. More positive EBVs indicate more
• 400: 400-Day Weight EBV (kg) is calculated from the weight of progeny taken subcutaneous fat and earlier maturity. Two fat EBVs are listed as there is variation
between 301 and 500 days of age, adjusted to 400 days and for dam age. This between animals regarding fat depth at the two sites.
EBV is the best single estimate of an animal’s genetic merit for yearling weight. • IMF: Intra-muscular Fat Percent EBV (%) is an estimate of the genetic
• 600: 600-Day Weight EBV (kg) is calculated from the weight of progeny taken difference in the percentage of intra-muscular fat at the 12/13th rib site
between 501 and 900 days of age, adjusted to 600 days and for dam age. This in a 300kg carcase. Depending on target markets, larger more positive
EBV is the best single estimate of an animal’s genetic merit for growth beyond values are generally more favourable.
yearling age. • Scrotal Size: EBV (cm) is an indicator of the male fertility in regards to semen
• Milk: 200-Day Milk EBV (kg) is an estimate of an animal’s milking ability. For quality and quantity. Higher (positive) EBVs indicate higher fertility. SS is also
sires, this EBV is indicative of their daughter’s milking ability as it affects the 200 positively associated with female fertility. The Orari Gorge recording for this trait
day weight of their calves. is done at 14 months.
• Mature Cow Weight: Mature Cow Weight EBV (kg) is based on the cow ACCOMMODATION
weight when the calf is weighed for weaning, adjusted to 5 years of age. This
Four Peaks Motel: Offer 10% discount if stated you are attending the sale.
EBV is an estimate of the genetic difference in cow weight at 5 years of age
Tel: (03) 693-8339, Fax: (03) 693-8339, Freephone: 0800-473-257 Email:
fourpeaksmotel@xtra.co.nz
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