養豚用飼料の給与がブリの成長および消化におよぼす影響

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  • Effects of swine diet feeding on growth and digestion in yellowtail
  • ヨウトンヨウ シリョウ ノ キュウヨ ガ ブリ ノ セイチョウ オヨビ ショウカ ニ オヨボス エイキョウ

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This study aimed to investigate the effect of feeding swine diet on growth and digestion in yellowtail Seriola quinqueradiata. Commercial extruded pellet was used as control diet.Experimental diet (swine diet) was prepared by replacing 50% of control diet with commercial swine diet. Yellowtail were fed experimental diets for 16 days. Thereafter, fish were fasted for 2 days and fed the experimental diets to satiation. Blood and gastric/intestinal digesta were sampled at 0, 1, 3, 6 and 24 h after feeding. Final body weight, weight gain and specific growth rate in fish fed control diet were significantly higher than those of fish fed swine diet. Feed conversion ratio was also significantly superior in fish fed control diet. Gastric digesta content was significantly higher in fish fed swine diet at 3 h after feeding. However, no significant difference was shown at 6 h after feeding. Intestinal digesta content was not significantly different between dietary groups. Serum protein was significantly higher in fish fed control diet at 1 and 3 h after feeding. The other serum components were not changed between dietary groups. These results seem to be caused by lower protein level of swine diet and worse utilization of carbohydrate.

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