Nutritional value of enzyme-treated soybean meal, concentrated degossypolized cottonseed protein, dried porcine solubles and fish meal for 10- to -20 kg pigs

The digestible energy (DE) and metabolizable energy (ME) content (Exp.1), and apparent or standardized ileal digestibility coefficients (AIDC or SIDC) of crude protein (CP) and amino acid (AA) (Exp.2) in Soyppt-50% (S50), Hamlet Protein 300, (HP300), concentrated degossypolized cottonseed protein (CDCP), Palbio 50 RD (P50) and fish meal fed to piglets were estimated. In Exp.1, 36 barrows (10.19 ± 1.35 kg BW) were randomly divided into 6 diets with 6 pigs per diet. A basal diet and 5 diets containing 800 g/kg basal diet and 200 g/kg of each test protein ingredient were prepared. In Exp.2, 38 barrows (12.61 ± 1.45 kg BW) were randomly allotted to 1 of 6 diets with 6 pigs except for N-free diet (n = 8). 5 diets containing each of test protein ingredient as the sole source of AA and a N-free diet were formulated. At the end of the trial, ileal digesta of each pig was collected using the slaughter method. Results indicated that S50 contained more DE (16.28 MJ/kg) (P < 0.05) than CDCP (15.79 MJ/kg) and P50 (15.16 MJ/kg), but less (P < 0.05) than HP300 (16.53 MJ/kg) and fish meal (16.59 MJ/kg). The ME content in CDCP (14.68 MJ/kg) was less (P < 0.05) than in S50 (14.47 MJ/kg), HP300 (15.77 MJ/kg) and fish meal (15.63 MJ/kg), but greater (P < 0.05) than in P50 (13.11 MJ/kg). P50 had lower (P < 0.05) AIDC or SIDC of CP and most indispensable AA compared with other protein ingredients. AIDC or SIDC of CP and most indispensable AA in HP300 and CDCP were no differences, but greater (P < 0.05) than in other protein ingredients. S50 and fish meal had similar AIDC or SIDC of CP and most indispensable AA. In summary, S50, HP300 and CDCP had promising potential to replace fish meal in piglet diet after adding appropriate amount of fat and crystalline AA.