Page 67 - Otapawa Bull Sale 2021 ebook

Milk: 200 Day Milk EBV is an estimate of an animal’s milking ability. For sires, this EBV is
indicative of their daughter’s milking ability as it affects the 200 day weight of their calves.
200 Day Weight: Is calculated from the weight of progeny taken between 80 and 300 days
of age, adjusted to 200 days.
400 Day Weight: Is calculated from the weight of progeny taken between 301 and 500 days
of age, adjusted to 400 days.
600 Day Weight: Is calculated from the weight of progeny taken between 501 and 900 days
of age, adjusted to 600 days.
Mature Cow Weight: Is an estimate of the genetic difference in a cow weight
at 5 years of age.
Carcase Weight: Estimates the genetic differences in a carcase weight at a standard age
of 650 days.

EMA: Eye Muscle Area EBV (cm) estimates genetic differences in eye muscle area at the
12/13th rib site of a 300kg dressed carcase. A more positive EBV indicates better muscling
on animals.
Rump: Estimates the genetic differences in fat depth at the P8 site
of a 300kg dressed carcase.
Rib Fit: Estimates the genetic differences in Fat depth at the 12/13th rib of a 300kg
dressed carcase.
Retail Beef Yield: Represents total (boned out) meat yield as a percentage
of a 300kg dressed carcase.
HYPOTRICHOSIS IN HEREFORD CATTLE
(Hypotrichosis - Hairlessness. It expresses itself as complete or partial loss of hair) All genetic
material in an individual animal comes in pairs, including the area of DNA where the mutation
responsible for Hypotrichosis in Hereford cattle occurs. Each individual has a pair of markers
(alleles) for the Hypotrichosis mutation, and has inherited one from the sire and one from the
dam. Hypotrichosis in Hereford cattle is inherited as a simple autosomal recessive trait. This
means that for an individual to be affected by the disease it must have 2 markers for the
mutation (1 from the sire and 1 from the dam). Those individuals that carry 1 marker for the
mutation and 1 normal marker will be unaffected by the disease, but can pass the mutation
on to their offspring.
The purpose of this test is to detect the carrier individuals – those animals carrying 1 copy of
the mutation responsible for Hypotrichosis, but unaffected by the disease.
BREED OBJECT / SELECTION INDEXES
New Zealand Herefords currently report three different selection indexes. These are the
Hereford Prime Index, Beef Heifer Index and the Dairy Beef Index. These Indices relate to
typical commercial herds in New Zealand targeting these specifications.
Index values are reported as EBVs, in units of relative earning capacity ($) for a given market.

OTAPAWA 65