Breeding and Genetics

Carcass EPDs from Angus Heifer Real-time Ultrasound Scans

  • Doyle E. Wilson (Iowa State University)
  • Gene H. Rouse (Iowa State University)
  • Craig L. Hays (Iowa State University)


The objective of this research was to use developing Angus heifer real-time ultrasound records to estimate genetic parameters and calculate carcass EPD for external 12-13th rib fat (FAT), rump fat thickness (RFAT), ribeye area (REA), and % intramuscular fat (%IMF). Heritability estimates are all of a moderate level (> .40) and are higher than the estimates determined previously with bull-only ultrasound data. Genetic correlations are generally of the same magnitude and same sign as previously reported with the bull-only ultrasound data. Angus breeders need to be alerted to the fact that developing heifers can be scanned to accurately predict carcass merit in steer-mate half-sibs. The results of this research indicate that the heifer data may be more accurate than the half-sib yearling bulls findings because the heritability estimates from the heifer data are higher than those estimated from the yearling bull data.

Keywords: ASL R1736

How to Cite:

Wilson, D. E., Rouse, G. H. & Hays, C. L., (2002) “Carcass EPDs from Angus Heifer Real-time Ultrasound Scans”, Iowa State University Animal Industry Report 1(1).

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Published on
01 Jan 2002
Peer Reviewed