EVALUATION OF A HYDROLIZED PIG BRISTLE MEAL AS A FISH MEAL REPLACER IN DIETS FOR OLIVE FLOUNDER Paralichthys olivaceus AND COMMON CARP Cyprinus carpio

Pig bristle meal (PBM) is made from pig hair by hydrolysis process and contains about 80% crude protein. This study was conducted to evaluate PBM as a FM replacer in diets for juvenile olive flounder (Exp-1) and common carp (Exp-2).

In Exp-1, six diets (PBM0, PBM3, PBM6, PBM9, PBM12 and PBM15) were prepared to contain 0, 3, 6, 9, 12 and 15% PBM replacing FM. Triplicate groups of olive flounder (Initial BW, 8.69 g) were fed one of the diets to apparent satiation for 8 weeks. At the end of the feeding trial, growth performance was significantly affected by the dietary treatments. All groups showed significantly lower growth compared to the control group except for PBM3. Hemological parameters were not significantly different. PBM6 group showed the highest lysozyme activity while PBM9 group exhibited the highest immunoglobulin level. Increasing levels of PBM in diets resulted in decreased apparent dry matter and crude protein digestibilities. In Exp-2, six diets (PBM0, PBM4, PBM8, PBM12, PBM16 and PBM20) were prepared to contain 0, 4, 8, 12, 16 and 20% PBM replacing FM. Triplicate groups of common carp (Initial BW, 3.7 g) were fed one of the diets to apparent satiation for 8 weeks. At the end of the feeding trial, growth performance and feed utilization were significantly affected by the dietary treatments. Increasing levels of PBM in diets resulted in decreased growth performance. PBM4 and PBM8 groups showed significantly higher protein digestibility compared to the control group.

Those results indicate that up to 7.5% of FM protein can be replaced by PBM with supplementation of limiting amino acids in diets for olive flounder. In diet for common carp, up to 14% FM protein can be replaced by the PBM without supplementation of limiting amino acids.