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Animal Sciences

Beef Research Report, 2003

ASL R1823

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Estimating Heritability Of Percentage Of Intramuscular Fat And Ribeye Area Measures By Scan Session In Angus Bulls And Heifers, Abebe T. Hassen, Doyle E. Wilson, Gene H. Rouse Jan 2004

Estimating Heritability Of Percentage Of Intramuscular Fat And Ribeye Area Measures By Scan Session In Angus Bulls And Heifers, Abebe T. Hassen, Doyle E. Wilson, Gene H. Rouse

Beef Research Report, 2003

The present study included 3,066 ultrasound-predicted percentage of intramuscular fat (UPFAT) and 4,502 ultrasound ribeye area (UREA) measures of bulls and heifers from the Iowa State University beef cattle breeding project. Data were collected over a four-year period between 1998 and 2001. The objective of the current study was to estimate variance components and heritability of UPFAT and UREA. Data were analyzed based on single- and multiple-trait animal models. Heritability of UPFAT increased from a minimum of 0.36 at a mean age of 37 weeks to a maximum of 0.54 at a mean age of 54 ...