Description of Expected Progeny Differences

Birth EPD (Pounds) is based on the measured birth weight of progeny, adjusted for dam age. The lower the value the lighter the calf at birth and the lower the likelihood of a difficult birth. This is particularly important when selecting sires for use over heifers.

Milk EPD (Pounds) is an estimate of an animal's milking ability. For sires, this EPD indicates the effect of the daughter's milking ability, inherited from the sire, on the weaning weight of her calves. For dams, it indicates her own milking ability.

Weaning EPD
(Pounds) is calculated from the weight of progeny taken between 80 and 300 days of age. Values are adjusted to 205 days and for age of dam. This EPD is the best single estimate of an animal's genetic merit for growth to early ages.

Yearling EPD (Pounds) is calculated from the weight of progeny taken between 301 and 450 days of age, adjusted to 365 days and for age of dam. This EPD is the best single estimate of a sire's genetic merit for yearling weight.

Maternal Weaning Weight EPD
(Pounds) is a combination of Milk and Weaning EPDs and estimates the genetic merit of the animal to produce a calf at weaning.

Scrotal Circumference EPD (Centimetres) is calculated from measurements of scrotal size in yearling bulls. Scrotal circumference is a good indicator of puberty, fertility and semen quality/quantity. Increased scrotal size will also result in decreased age of puberty in daughters and greater lifetime production. Positive EPD values indicate larger scrotal circumference.

Stayability EPD
is calculated from calving and pedigree information. It predicts genetic differences in the likelihood that daughters will remain in production until six years of age or beyond. EPD's are expressed as deviations from a 50% probability.

Docility EPD
is calculated from measurements of temperament score. Positive EPD values indicate a tendency towards more acceptable temperament.

Marbling Score EPD is calculated from numeric scores assigned to each carcass quality grade division. Data is adjusted to a standard carcass weight. Positive EPD values indicate greater numeric marbling scores.

Carcass Weight EPD
(Pounds) is calculated from carcass data available on the progeny of sires. Positive values indicate heavier carcass weights.

Ribeye Area EPD
(square inches) is calculated from carcass measurements of rib eye area taken between the 12th and 13th rib, and is closely associated with percent retail product when carcass weight is held constant. Positive values indicate larger ribeye areas.

Retail Yield EPD (percent) estimates the genetic differences between animals in percentage retail beef yield for a standard carcass weight. Positive values indicate a higher percentage retail yield.

- Each EPD is presented with an associated accuracy figure.Accuracy expresses the reliabilty of the EPD and in presented as a number between .01 and .99

# Herds
- is the number of herds from which progeny data on the sire has been analysed.