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Restricted levels of feed intake or production conditions that require more feed for greentea body maintenance (i.e., cold environment) will increase the portion of fat that must undergo metabolic transformation and the associated inefficiencies of use. The energy value of a pound of digestible fat source in pigs allowed to consume feed ad libitum is estimated to be 3.8 times that of a pound of corn for pigs housed in a warm environment versus only 2 times the value of corn in a cold environment. If feed intake is restricted due to overcrowding, greentea limit greentea feeding practices, postweaning food intake slump, the relative energy value of fat may be lowered. The economic value of dietary fat can be estimated from the impact of dietary fat additions on the days required for pigs to reach market weight, the pounds of feed required per pig, and the pig’s carcass merit (i.e., backfat thickness or lean content). The growth response of growing pigs (from 50 to 250 lb body weight) to each net addition of 1% dietary fat is shown in Table 1.
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