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Dry grape extract as alternative for vitamin E in shrimp fee

Researchers in Taiwan have found that dry grape extract is an antioxidant solution that can be used as an alternate for vitamin E in shrimp starter diets.

October 9, 2019


TAIWAN - Researchers in Taiwan have found that dry grape extract is an antioxidant solution that can be used as an alternate for vitamin E in shrimp starter diets. 

Nor-Feed carried out the 8-week trial at the National Taiwan Ocean University to evaluate the effect of a supplementation with Nor-Grape 80 on the growth performances of the Pacific White shrimp (Litopenaeus vannamei), at an early stage. Nor-Grape 80 is a dry grape extract registered as a feed additive in the European Union and many jurisdictions around the world, able to provide a powerful antioxidant effect to optimize vitamin E utilization.

Though the complete replacement of vitamin E is not common, the dry grape extract was utilized as an alternative to vitamin E for the purposes of the study. Five diets were formulated for the trial as follows:

  • Control Group: 100 ppm vitamin ENG1: 0 ppm vitamin E + 50 ppm Nor-Grape
  • NG2: 0 ppm vitamin E + 100 ppm Nor-Grape
  • NG3: 0 ppm vitamin E + 150 ppm Nor-Grape
  • NG4: 0 ppm vitamin E + 200 ppm Nor-Grape

The initial size of the shrimp in the study was 20 mg (post-larvae stage). Researchers recorded weight gain, Feed Conversion Ratio (FCR) and survival rate.

Results demonstrated that the replacement of vitamin E with Nor-Grape 80 led to an improvement of the FCR in all supplemented groups, despite the fact that vitamin E was totally removed. No difference was observed in terms of mortality between groups.

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