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Abstract Background Feeding spray dried plasma (SDP) to weanling pigs improves growth, but there is a lack of research on how SDP impacts oxidative stress and inflammatory response in lactating sows, and performance of their piglets after weaning. Therefore, an experiment was conducted to test the hypothesis that sows fed a diet with SDP in late gestation and lactation have improved reproductive performance and reduced inflammation compared with sows fed no SDP. The second hypothesis was that pigs weaned from sows fed 0.5% SDP in lactation have reduced diarrhea incidence and improved growth performance during the initial 14 d of the nursery period regardless of dietary SDP. Results The percent of low vitality or starved pigs during lactation was less (P