Effects of low acid-binding capacity specialty soy protein sources on nursery pig performance in a commercial environment

Two experiments were conducted to determine the effects of low acid-binding capacity ( ) specialty soy protein sources on weanling pig performance. In experiment 1, 2,260 pigs, initially weighed 6.7 kg, were used to determine the effects of low ABC soy proteins as a replacement to poultry meal ( ) or spray-dried blood plasma ( ). Treatments were arranged in a 2 × 2 factorial plus a control diet fed in two phases. There were 20 or 21 pigs per pen with 22 replications (pens) per treatment. The control diet contained PM (AV-E Digest, XFE Products, Des Moines, IA) and SDBP (Appetein, APC Inc., Ankeny, IA). Specialty soy protein concentrate ( ; AX3 Digest, Protekta, Newport Beach, CA) and microbial-enhanced soybean meal ( ; MEPRO; Prairie Aquatech, Brookings, SD) were used to replace PM or PM and SDBP on a standardized ileal digestible Lys basis. From d 0 to 21 and d 0 to 42, pigs fed either soy protein source replacing PM had greater ( ≤ 0.016) average daily gain ( ) and average daily feed intake than pigs fed PM. From d 0 to 21, pigs fed SSPC had increased (