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Animal Sciences

Beef Research Report, 2003

ASL R1825

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Heritability And Repeatability Of Ultrasound Predicted Percentage Of Intramuscular Fat Measures In Angus Bulls And Heifers, Abebe T. Hassen, Doyle E. Wilson, Gene H. Rouse Jan 2004

Heritability And Repeatability Of Ultrasound Predicted Percentage Of Intramuscular Fat Measures In Angus Bulls And Heifers, Abebe T. Hassen, Doyle E. Wilson, Gene H. Rouse

Beef Research Report, 2003

The present study included repeated ultrasound-predicted percentage of intramuscular fat (UPFAT) measures from 675 Angus bulls and heifers collected over a three-year period between 1998 and 2000. Each year cattle were scanned four to six times for UPFAT and other ultrasound traits, starting at a minimum age of 28 weeks. The objective of the current study was to estimate variance components, heritability, and repeatability of UPFAT in young bulls and heifers. Heritability of UPFAT ranged from 0.32 at 28 weeks of age to a maximum of 0.53 at 63 weeks. Repeatability of UPFAT increased from a minimum of ...