Effect of protein solubility of soybean meal on growth, digestibility and nutrient utilization in Penaeus vannamei
2017
Jannathulla, Rajabdeen | Dayal, Jagabattula Syama | Ambasankar, Kondusamy | Khan, Hajah Imran | Madhubabu, Eda Purudhvi | Muralidhar, Moturi
Soybean meal was subjected to autoclaving for different durations (0, 5, 10, 15, and 20 min) to alter its protein solubility index (PSI). As a result of autoclaving, the PSI of soybean meal was reduced from 85–64% but the protein quantity was not affected. Among amino acids, methionine and cystine were reduced significantly (P < 0.05) beyond autoclaving for 15 min. Trypsin inhibitor was below detectable level after 20 min of autoclave. Saponin and phytic acid were reduced by 0.3–8 and 1–24%, respectively, in treated soybean meal. Five iso-nitrogenous diets were formulated by replacing untreated soybean meal using processed soybean meal, and its effects on growth performance, feed efficiency, and digestibility parameters were assessed in Penaeus vannamei. The results revealed that the growth rate was not affected (P > 0.05) in shrimp fed with diets having soybean meal autoclaved up to 10 min (PSI 72%). The similar trend was noticed in feed efficiency parameters. The apparent dry matter and crude protein digestibility parameters were reduced (P < 0.05) in shrimp fed diets having soybean meal autoclaved for 15 and 20 min (PSI 68 and 64%). The inclusion of processed soybean meal has not influenced the shrimp carcass composition. The present study showed that though anti-nutritional factors were reduced in prolonged heat treatment, the declined protein solubility has resulted in the reduction of growth parameters and digestibility in those treatments. Hence, the present preliminary results suggest to scrutinize the quality of protein whenever heat is being applied during the processing of soybean meal and also other protein sources.
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