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EPD and $Value Definitions

PRODUCTION EPDs

Calving Ease Direct (CED)

is expressed as a difference in percentage of unassisted births, with a higher value indicating greater calving ease in first-calf heifers. It predicts the average difference in ease with which a sire's calves will be born when he is bred to first-calf heifers.

Birth Weight EPD (BW)

Weaning Weight EPD (WW)

Yearling Weight EPD (YW)

expressed in pounds, is a predictor of a sire's ability to transmit birth weight to his progeny compared to that of other sires.

expressed in pounds, is a predictor of a sire's ability to transmit weaning growth to his progeny compared to that of other sires.

expressed in pounds, is a predictor of a sire's ability to transmit yearling growth to his progeny compared to that of other sires.

MANAGEMENT EPDS

Claw Set EPD (Claw)

 is expressed in units of claw-set score, with a lower EPD being more favorable indicating a sire will produce progeny with more ideal claw set. The ideal claw set is toes that are symmetrical, even and appropriately spaced.

Foot Angle EPD (Angle)

is expressed in units of foot-angle score, with a lower EPD being more favorable indicating a sire will produce progeny with more ideal foot angle. The ideal is a 45-degree angle at the pastern joint with appropriate toe length and heel depth.

Pulmonary arterial pressure EPD (PAP)

is expressed in millimeters of Mercury (mmHg), with a lower EPD being more favorable indicating a sire should produce progeny with a lower PAP score. PAP score is an indicator of susceptibility to high altitude disease commonly experienced at elevations greater than 5,500 feet. Selection for this trait aims to improve the genetic potential for a sire’s progeny to have lower PAP scores thus a lower chance of contracting high altitude disease increasing the environmental adaptability of cattle living in mountain areas.

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