Yearling Weight EPD (YW) The expected difference in average yearling weight of progeny. The evaluation reflects genetic influence on both pre-weaning and post- weaning growth rate.
Total Maternal EPD (TM) A value to predict the weaning weight performance of calves from a animal’s daughters due to genetics for growth and maternal ability. Total Maternal is calculated by adding ½ the WWT EPD to the Maternal Milk EPD.
Birth Weight EPD (BW) The expected difference in average birth weight (pounds) of progeny. Birth weight reflects prenatal growth.
Scrotal Circumference EPD (SC) 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.
Top % Percentile Rank for each given trait compared against the breed with 50% being breed average and Top 10%, for example, being elite and in the Top 10% of all registered animals for that trait.
Weaning Weight EPD (WW)
Maternal Milk EPD (Milk) 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.
Terminal Sire Index (TSI) The AICA Terminal Sire Index (TSI) is a formal method of combing Expected Progeny Differences (EPD) – BWT, WWT, YWT, REA, HCW, 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 in the AICA database, ranking them for profit potential. This dollar index is to be interpreted much like 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 ($200.00 minus $191.66) than Sire A’s offspring. Act BW Actual birth weight. Adj. WW Weaning Weight adjusted to a common endpoint of 205 days for comparison. Adj. YW Yearling Weight adjusted to a common endpoint of 365 days for comparison. ADG Average Day Gain from weaning day to March 8th, when yearling weights were taken, using actual weights divided by the number of days in that period, (roughly 160 days.) Ratio The ratio or index provided for WW, YW, ADG, and REA for comparison with 100 being the average of the contemporary group, 110 = 10% above average, 90 = 10% below average, etc. All the bulls are recorded in the same contemporary group. Embryo Transfer bulls and Twins do not have a provided Ratio.
The expected difference in average weaning weight of calves. The evaluation reflects the genetic influence on pre-weaning growth rate.
WCR LIBERATOR 392 P
1
BD: 2/1/23
Reg.: M987678
Polled
Sired by: WCR FORTRESS 0516 ET P
RATIO
PVF RIDGE 7142
WCR MS RIDGE 1534 ET P EF1313308
Act. BW 82
WCR MS FIREWATER 1242 P
Adj. WW 714 103 Adj. YW 1320 115 ADG 3.79 134
BW WW YW MILK TM SC TSI EPD -1.8 72 151 28 64 1.5 298.70 TOP % 40 20 2 30 15 8 1
CW REA
FAT
MARB
EPD
38
0.63
0.012
0.21
Carcass Weight EPD (CW) Expected progeny differences for Carcass Weight is a predictor of pounds of retail product at a constant age
Ribeye Area EPD (REA) Ribeye area is measured from a cross-sectional area of the longissimus dorsi muscle at the 12th rib. Ribeye area is a major component of the USDA yield grade equation and selection for increased ribeye area should result in larger 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 are expressed in square inches and is a predictor of differences in ribeye area between parents progeny at a constant age endpoint.
Fat Thickness EPD (FAT) Fat thickness is measured at the 12th rib and is the primary component to 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 Thickness EPD are expressed in inches and are a predictor of differences in fat thickness between parent’s progeny at an age constant endpoint.
Marbling Score (MARB) Marbling is a subjective measure of the amount of intramuscular fat in the ribeye muscle. Marbling score is the primary component of USDA Quality grade and selection for increased Marbling Score EPD should result in cattle with higher quality grades at the same age endpoints. Marbling score has a small genetic correlation with fat, therefore producers may select for increased marbling score EPD while not changing external fat thickness when cattle are harvested at the same age-constant endpoint. Marbling EPD is a prediction of the differences in the USDA subjective marbling score between parent’s progeny at an age constant endpoint. Marbling is expressed in the same units as the USDA Marbling Score.
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 Weight EPD are expressed in pounds and is a predictor of the differences in hot carcass weight between parents progeny at an age constant endpoint.
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Wienk Charolais 56th Annual Sale
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