|EPDs -||How to use the animal & EPD search forms|
|How to read the results|
How to read the results
EPD’s are an estimate of an animal's genetic worth for that particular trait. An EPD is expressed in the units of measure for that trait. EPD’s are based on a combination of performance information from an animal's pedigree, individual and progeny performance. EPD’s can be used to predict one animal's progeny performance compared to another's progeny. EPD’s can also be used to compare the genetic worth of one animal to the overall Red Brangus population average and distribution. Each calculated EPD has an associated accuracy value.
An accuracy value calculated by the genetic analysis is a number between 0 and 1. Accuracy is a relative indicator of the confidence you can place in that particular EPD. The closer an accuracy is to one, the more reliable is the estimate.
Accuracy ranges from 0-99% and indicates the probability of an EPD changing with the addition of more progeny data. The magnitude of possible change decreases as accuracy increases. Accuracy below 75% should be regarded as low, between 76-90% as medium and above 90% as high.
An EPD with an accuracy of "P" is "Pedigree Estimate" and is simply the exact average of that animal's parents.
Accuracy is based on the amount of performance information available on the animal and its close relatives - particularly the number of progeny analyzed. Accuracy is also based on the heritability of the trait and the genetic correlations with other recorded traits. Hence accuracy indicates the "confidence level" of the EPD.
Regn. No: The Association Registration Number of the animal.
Name: The registered name of the animal.
Birth Weight (BW) :
The BW EPD is an indicator of birth weight and calving ease. Progeny sired by a bull with a BW EPD of 2.2 can be expected to weigh 3.2 lb. more at birth, on average, than progeny sired by a bull with an EPD of -1.0 lb. (2.2 minus -1.0 = 3.2 lb.) Birth weight is another indicator of calving ease. Larger BW EPDs usually, but not always, indicate more calving difficulty.
Weaning Weight (WW)
The WW EPD reflects pre-weaning growth potential. Measured from adjusted 205-day weight. It is an indicator of direct genes for growth independent of milk production of the dam. Calves sired by a bull with a WW EPD of 30 should have a 20 lb. advantage in 205-day adjusted weaning weight compared to calves sired by a bull with an EPD of +10 lb. (30 minus 10.0 = 20 lb.).
Yearling Weight (YW) :
YW EPD for a sire with an EPD of 87 indicates that on average, his progeny should be 30 lb. above the average of progeny of a bull with an EPD of 57 lb. YW EPD reflects differences in the 365-day adjusted yearling weight for progeny. It is the best estimate of total growth.
Milk (MM) :
The MM EPD is a prediction of weaning weight differences due to milk and maternal ability of the dam. For a sire, the MM EPD predicts the maternal ability of his daughters expressed in pounds of calf weaned. MM EPD’s do not specifically predict pounds of milk produced, but pounds of calf weaned due to maternal production of the dam. It predicts the difference in average weaning weight of sires’ daughters’ progeny due to milking ability. Daughters of a sire with a MM EPD of 14 should produce progeny with 205-day weights averaging 24 lb. more (as a result of greater milk production) than daughters of a bull with a MM EPD of -10 lb. (14 minus -10.0 = 24 lb.). This difference in weaning weight is due to total milk production over the entire lactation period.
Total Maternal (TM) : Statistics
The TM EPD is a combination EPD. It is the Mat EPD plus 1/2 the WW EPD. It has no accuracy value since it is simply a combination of two other EPD’s. A sire's TM EPD reflects what he is expected to transmit to his daughters for a combination of both growth genetics (WW EPD) and maternal production (Mat EPD). This EPD is sometimes referred to as “Milk & Growth” or “combined maternal.”