Estimates of relative economic importance for alternative genetic changes in performance are commonly used in predicting optimum emphasis for pig selection programs (e.g., Hazel, 1943; NSIF, 1981). These estimates have been based upon much less complete evaluation of effects on cost/unit of output than is possible from bio-economic simulation of pork production systems. The systems approach requires a comprehensive model to simulate effects of genetic change in each component of performance on feed and non—feed inputs and on outputs for all phases of the life-cycle and for all subpopulations of industry purebred or crossbreeding systems (Dickerson, 1973, 1978). This approach is appropriate if the primary objective in pig improvement is reduction of total costs per unit of pork produced, leading to some combination of larger profit margins for some producers and lower prices for consumers (Dickerson, 1970, 1981; Harris, 1970; Moav, 1973). The purpose of this paper is to compare breeding objectives based upon simulation of pork production systems with those currently used in pig breeding programs.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 578–587, 1982
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