Estimating the Economic Value of Specific Characteristics Associated with Angus Bulls Sold at Auction

Table 1. (Continued)

Variable	Abbreviation	Expected Sign	Definition
Ultrasound percent intramuscular fat EPD	Uimfepcl*	+	A predictor of the difference in a bull’s progeny for percent intramuscular fat in the ribeye muscle compared to other bulls (based on ultrasound measurements).
Ultrasound ribeye area EPD	uribepcl*	+	A predictor of the difference in square inches of ribeye area of a bull’s progeny compared to the progeny of other bulls (based on ultrasound measurements).
Ultrasound fat thickness EPD	ufatepel*	+	Expressed in inches, is a predictor of the difference in external fat thickness at the 12th rib of a bull’s progeny compared to the progeny of other bulls. It includes the weighted average of 60% of the rib fat measurement and 40% of the rump fat measurement (based on ultrasound measurements).
Ultrasound percent retail product EPD	uprpepcl*	+	A predictor of the difference in pounds of salable retail product of a bull’s progeny compared to the progeny of other bulls (based on ultrasound measurements).
Sale order	Saleorder	—	Order of the sale that a bull was sold in percent.
Percent of semen retained	semenpet	+	Percent of semen rights that are retained by the seller.
Season of the sale	Seasonofsale	?	Dummy variable denoting the season (fall or spring) that the sale was held. Fall is the base.
Picture of the bull	picture	+	Dummy variable denoting bulls whose picture appeared in the sale catalog.
Embryo transfer	et	?	Dummy variable denoting bulls who are listed as embryo transfers in the sale catalog.
Full brother	fullbrother	?	Dummy variable denoting bulls who have a full brother, either through embryo transfer or as a twin, in the sale.
Pathfinder dam	pathfinder	?	Dummy variable denoting bulls whose dam is a pathfinder.
Female in the sale	femaleinsale	?	Dummy variable denoting sales selling females as well as bulls.
Sire	s`r(i)	?	Dummy variable denoting bulls whose sire was ranked in top 25 for number of progeny registered in 2002.
Sale	sale(i)	?	Dummy variable denoting individual sales.

Note: Definitions are taken from www.angus.org/sireeval/howto.html (Accessed June 28, 2007).
a Definitions are taken from Beef Improvement Federation.

Jones et al.: Value of Bull Characteristics 319

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