다양한 형태의 곳체다슬기 (Semisulcospira gottschei) 치패용 배합사료에 대두박과 소맥분 이용성

Abstract

A feeding trial was carried out to investigate the utilization of dietary soybean meal and wheat flour as substitutes for fish meal and alginate in different dietary types (powder, pellet and flake) for juvenile snail (Semisulcospira gottschei). After 10 weeks feeding trial, survival was not affected by formulation and type of diets (P>0.05), but weight gain was significantly affected by dietary formulation (P<0.001) and type (P<0.05). In the same dietary formulation, weight gain of the snail fed the flake type of diets was lower than that of the snail fed the powder or pellet types. However, the type of diet did not affect weight gain when snail fed diets containing <TEX>$37\%$</TEX> soybean meal and <TEX>$18\%$</TEX> alginate. The weight gain was lower in the snail fed diets containing <TEX>$25\%$</TEX> fish meal compared with that of the snail for diets containing <TEX>$33-37\%$</TEX> soybean meal at the same dietary type. When soybean meal was used as main protein source in diets, weight gain was not affected by dietary alginate <TEX>$(0\;and\;18\%)$</TEX> and wheat flour <TEX>$(36\;and\;58\%)$</TEX> contents. Crude protein and ash contents of whole body of the snail was not affected either by formulation or by type of diet. Moisture and crude lipid contents of the whole body were significantly affected by dietary formulation, but not by the type. These results indicate that <TEX>$25\%$</TEX> fish meal could be replaced by <TEX>$37\%$</TEX> soybean meal as dietary protein source, and pellet and powder could be desirable dietary type for the optimum growth of the snail.