UNDERSTANDING EPDS Expected Progeny Differences
HBR Profit 406 P M960205 Name Registration #
BW ACC
SC ACC
BW EPD
WW EPD
YW EPD
Milk EPD
TM EPD
SC EPD
CW EPD
REA EPD
Fat EPD
Marb EPD TSI
Lot
HS DOB
Sire
1
P
10/21/21
HBR Profit 645 P
70
-2.4 51 94
31
56 0.7 25 0.44 0.001 -0.03 234.80
BIRTH WEIGHT (BW acc) Actual weight measurement at birth.
Carcass weight (CW EPD) Expected progeny differences for Carcass Weight is a predictor of pounds of retail product at a constant age endpoint. Selection for increased values should result in heavier carcasses, while selection for decreased values should result in lighter carcass weights at the same age endpoint. Carcass weights EPD is expressed in pounds and is a predictor of the differences in hot carcass weights between parent’s progeny at an age constant endpoint. Ribeye area (REA EPD) Ribeye area is a major component of the USDA yield grade equation and selection for increased ribeye area should result in large ribeyes and lower yield grades between animals with the same carcass weight. Ribeye area has a positive relationship with weight, the larger the animal, the larger the ribeye area. Ribeye Area EPD is expressed in square inches and is a predictor of differences in ribeye area between parent’s progeny at a constatnt age point. Fat thickness (fat EPD) Fat thickness is the primary component of the USDA Yield Grade equation. Fat thickness has a negative relationship to cutability; therefore, selection based on decreased fat thickness should result in lower yield grades and leaner cattle given the same age endpoint. Fat EPD is expressed in inches and is a predictor of differences in fat thickness between parent’s progeny at an age constant endpoint. Marbling score (Marb EPD) Marbling Score EPD is a prediction of the differences in the USDA subjective marbling score. Marbling is a subjective measure of the amount of intramuscular fat in the ribeye muscle. Terminal sire index (TSI) The Terminal Sire Index is a formal method of combining EPDs - BW, WW, YW, REA, CW, MARB, and FAT - into one single value on which to base selection decisions. The TSI uses estimates of the genetic relationships between traits with an economic default value based on three year rolling USDA data. The TSI represents a dollar index per terminal progeny produced for a bull, ranking them for profit potential. This dollar index is to be interpreted much like a single trait EPD. For example, if Sire A’s index is $191.66 and Sire B’s index is $200.00, then we would expect Sire B’s offspring to average $8.34 more net return than Sire A’s offspring.
Scrotal Circumference (SC acc) Actual scrotal circumference measurement (in centimeters).
Birth Weight EPD (Bw Epd) The expected difference in average birth weight (pounds) of progeny. Birth weight reflects prenatal growth.
Weaning Weight EPD (WW epd) The expected difference in average weaning weight of calves. The evaluation reflects the genetic influence on pre-weaning growth rate.
Yearling Weight EPD (YW epd) The expected difference in average yearling weight of progeny. The evaluation reflects genetic influence on both pre-weaning and post-weaning growth rate.
Milk EPD The genetic ability of a sire’s or dam’s daughters to express in pounds of weaning weight in her calves due to her maternal ability through mothering instinct and milk.
Total maternal EPD (tm epd) A value to predict the weaning weight performance of calves from an animal’s daughters due to genetics for growth and maternal ability. Total Maternal is calculated by adding 1/2 the WW EPD to the Milk EPD. Scrotal circumference epd (SC EPD) The expected difference in scrotal circumference (expressed in centimeters) of a bull’s or dam’s male offspring at yearling compared to progeny of all other animals evaluated. Research has also indicated a relationship between increased SC EPD and decreased age at puberty for daughters.
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