Molecular Nutrition

Alfalfa Sapoinin Promotes Astaxanthin Absorbtion of Blood Parrot Fish and Its Optimum Supplemental Level

  • WEI Minxia ,
  • SONG Hongmei ,
  • JIANG Yanling ,
  • LIU Yi ,
  • LIU Chao ,
  • WANG Xuejie ,
  • HU Yinchang
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  • 1. Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China;
    2. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China

Received date: 2015-02-20

  Online published: 2015-08-13

Abstract

This study was conducted to explore the promoting effect of alfalfa saponins on astaxanthin absorbtion of blood parrot fish and to determine the optimum supplemental level of alfalfa saponins. A total of 630 blood parrot fish, with the average body weight of (10.63±0.30) g, were divided into the following 7 groups: blank control group in which fish were fed a basal diet; astaxanthin control group in which fish were fed the basal diet supplemented with 300 mg/kg astaxanthin; five experimental groups in which fish were fed the basal diet supplemented with 300 mg/kg astaxanthin plus 800, 1 200, 1 600, 2 000 and 2 400 mg/kg alfalfa saponin, respectively. The experiment lasted for 60 days. The results showed as follows: 1) the diet supplemented with 300 mg/kg astaxanthin plus alfalfa saponin could enhance the growth indexes of fish. When alfalfa saponin supplemental level was 2 000 mg/kg, the specific growth rate reached its maximum value. 2) While the alfalfa saponin supplemental level arrived at 1 200 mg/kg, the scals, skin and caudal fin carotenoid contents were significantly higher than those in the astaxanthin control group and blank control group (P<0.05), and they reached their maximum values synchronously when alfalfa saponin supplemental level was 2 000 mg/kg. 3) While the alfalfa saponin supplemental level arrived at 1 200 mg/kg, the dorsa and caudal fin a* values were significantly higher than those in the astaxanthin control group and blank control group (P<0.05), but they reached their maximum values when the alfalfa saponin supplemental level was 2 000 and 1 600 mg/kg, respectively. These results demonstrate that adding alfalfa saponin to the diet supplemented with astaxanthin speed up growth and improve astaxanthin absorption of blood parrot fish. Combining with the results of specific growth rate, we suggest that the optimum supplemental level of alfalfa saponin added in the diet supplemented with 300 mg/kg astaxanthin was 2 000 mg/kg.

Cite this article

WEI Minxia , SONG Hongmei , JIANG Yanling , LIU Yi , LIU Chao , WANG Xuejie , HU Yinchang . Alfalfa Sapoinin Promotes Astaxanthin Absorbtion of Blood Parrot Fish and Its Optimum Supplemental Level[J]. Chinese Journal of Animal Nutrition, 2015 , 27(8) : 2589 -2596 . DOI: 10.3969/j.issn.1006-267x.2015.08.033

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