This study evaluates the effects of spray-dried plasma protein (SDP) on sow and litter performance during lactation. Dietary lactation treatments consisted of a corn-soybean meal control and a corn-soybean meal diet containing 0.5% SDP. Mature sows had a greater BW on d 107 of gestation, on d 1 postfarrowing, and at weaning; greater lactation ADFI; and greater litter BW after cross-fostering, but pig survival to weaning was decreased. Sows fed SDP had a greater gestation interval, litter BW at weaning, and litter ADG, with 1 less lactation day. The effect of SDP addition was dependent on sow parity, as noted by numerous SDP ¡Á parity interactions. The addition of SDP increased
lactation ADFI in mature sows but decreased ADFI in young sows. Mature sows fed SDP had a greater number
of pigs weaned per litter, litter and pig weaning weights, pig survival to weaning, and number of pigs weaned per litter weighing more than 3.6 kg, but the SDP diet had little to no effect on these responses in young sows. Subsequent farrowing data were collected, but no dietary treatment effects were observed.
The results of this research indicate that SDP increased productivity of sows in parity 4 or greater.

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