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Effects of birth weight (BiW) on preweaning mortality of piglets. Panel A: category analysis (piglets were assigned into 4 BiW categories: < 1.0 kg; 1.0 to 1.3 kg; 1.3 to 1.6 kg; and > 1.6 kg); Panel B: broken line regression analysis (piglets were categorized by 0.1 kg increments for BiW from 0.5 to 2.1 kg and BiW less than 0.5 or greater than 2.1 kg).
