Abstract
ABSTRACT The objectives of this study were to estimate the amount of feed and associated costs of adding BW to cull sows. Body weight, backfat, loin eye area, heart and jowl girth, and flank-to-flank measurements were recorded for 29 cull sows approximately every 14 d for a total of 96 d. Feed disappearance and BW gain for each interval was used to calculate performance traits, total revenue, total costs, and net margin. The period of greatest efficiency was from 0 to 14 d, equaling 0.37, 0.41, 0.26, and 0.28 for sows in USDA market weight classes 1 through 4, respectively. Feed efficiency decreased throughout the trial, yet at a slower rate. Average daily feed intake (i.e., feed disappearance), BW gain, and revenue increased (P
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