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backfat thickness or lean content). The growth media response of growing pigs (from 50 to 250 lb body weight) to each net addition of 1% media dietary fat is shown media in Table 1. The magnitude of the response to added dietary fat is linear for diets containing 3 to 12% total fat. Furthermore, the growth response to dietary fat does not differ substantially among pig genotypes or genders differing in their capacity for tissue growth, although these relationships have not been studied extensively. To calculate the economic value of fat, the non-feed fixed costs (dollar/pig/day for building and equipment charge, labor cost, etc.), feed cost (dollar/pound of feed), and premiums-penalties for carcass leanness (dollar/1 inch backfat/pig) must be estimated for each production-market situation. Based on assumed fixed and feed costs of $.14/day/pig and $.07/pound
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