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Effect of Plasma Lipids upon Beef Carcass Composition^1,2,

University of Wisconsin,³ Madison

Abstract

Twenty-six steers were fed ^{ad libitum} from 9 months of age to a shrunk weight of 432 to 477 kg. Blood samples were obtained at 9 months of age and at 30-day intervals until the animals reached 16 months of age.

Observations of total plasma fat taken at 16 months of age were correlated (P<01) with percent carcass fat, muscle and daily feed intake. Carcass fat was associated with total (P<05) and free (P<01) cholesterol determinations taken at 16 months of age. Forty-two percent of the variance in fat could be explained when final weight, final plasma total fat, final free cholesterol and final total cholesterol were used in a regression equation. Consequently, variables other than plasma lipids, observed between 9 and 16 months of age, account for the major portion of the variance in carcass fat in steers.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station.

² This investigation was partially supported by Public Health Research Grant RO1 AM 08647-01 from the National Institute of Arthritis and Metabolic Diseases.

³ Department of Meat and Animal Science, Paper No. 446.