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Phenotypic Expression of Muscle Fiber Types and Some Implications to Meat Quality¹

University of California², Davis 95616

Abstract

Changing attitudes and preferences of meat consumers within our present society, coupled with diminishing land resources available for meat animal production suggest that both producers and management will be under continuing pressure to reevaluate the types of meat animals produced, and the methods employed for their production. It could be anticipated, for example, that meat animal production will become more intensive; more animals will be produced on less land. Such changes may require adaptations of animal breeding, feeding, and product marketing techniques. The animals themselves may be increasingly exposed to environmental conditions different from those to which they have biologically adapted, thus a general increase in the level of "stress" to which the animals will be exposed becomes a real possibility. Increasing world demand for meat and meat products due to the rising level of affluence, could be expected to increase selection pressure for larger, faster growing, more muscular animals.

¹ Invitational paper presented at the Symposium on Protein Synthesis and Muscle Growth held during the 65th Annual Meeting of the American Society of Animal Science, Lincoln, Nebraska, July 28 to August 1, 1973.

² Laboratory of Muscle Biology, Department of Animal Science.

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