soybean meal, crude protein, finishing pigs


A total of 252 pigs (DNA 600 × 241, initially 238.8 lb) were used in a 21-d trial to determine the effects of replacing soybean meal (SBM) with soy protein concentrate (SPC) in diets containing 12% crude protein (CP) on growth performance of finishing pigs from 240 to 280 lb. Pens of 7 or 8 pigs were allotted by body weight (BW) and randomly assigned to 1 of 4 dietary treatments with 8 replications per treatment. Treatments consisted of 3 levels of SBM (10.6, 5.3, and 0%) with 12% CP and a negative control treatment with 4.0% SBM and 10% CP. Soy protein concentrate was increased as SBM decreased to maintain 12% CP. For overall growth performance, decreasing SBM marginally decreased (linear, P = 0.062) average daily gain (ADG) and worsened (linear, P = 0.061) feed efficiency (F/G). In conclusion, regardless of the 12% CP level, reducing the concentration of SBM and replacing it with SPC worsened ADG and F/G.


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