Dietary quercetin improved the growth, antioxidation, and flesh quality of grass carp (Ctenopharyngodon idella)

Abstract

To investigate the effects of dietary quercetin on growth, antioxidation, and flesh quality of grass carp, Ctenopharyngodon idella, six diets were prepared with quercetin inclusion rates of 0 (control diet), 0.1, 0.2, 0.4, 0.6, and 0.8 g/kg. Grass carp with a body weight of 13.3 ± 0.1 g were fed with one of the six diets for 60 days. The weight gain (WG) showed a quadratic relationship with dietary quercetin levels; the supplementation of 0.4 g/kg quercetin significantly improved WG (+4.73%) and decreased feed conversion ratio (−0.06) (p < .05) when compared to those of the control group. The intestinal fat ratio was reduced by the addition of 0.2 or 0.4 g/kg of quercetin (p < .05), and serum activities of alkaline phosphatase and superoxide dismutase were increased by the addition of 0.4 and 0.6 g/kg of quercetin (p < .05). The inclusion of 0.2–0.6 g/kg of quercetin increased the contents of delicious amino acids and decreased the cooking loss of flesh (p < .05). Flesh collagen content was increased by the addition of 0.4–0.8 g/kg of quercetin (p < .05). In conclusion, dietary quercetin could improve the growth and enhance the antioxidation and flesh quality of grass carp, with the recommended supplemental level of quercetin was 0.37 g/kg.

Dietary rutin promoted the growth, serum antioxidant response and flesh collagen, free amino acids contents of grass carp ( Ctenopharyngodon idella )

“…The supplementation of 0.2–1.6 g/kg quercetin in diets significantly increased weight gain and decreased FCR of tilapia (Zhai & Liu, 2013). The studies on olive flounder ( Paralichthys olivaceus ) (Shin et al., 2010), grass carp (Xu et al., 2019) and blunt snout bream ( Megalobrama amblycephala ) (Jia et al., 2019) also indicated that dietary quercetin improved the growth performance. In this study, the supplementation of 0.8 and 1.0 g/kg rutin also increased the weight gain and decreased FCR ( p < .05) (Table 3).…”

Influences of dietary Eucommia ulmoides extract on growth, flesh quality, antioxidant capacity and collagen-related genes expression in grass carp (Ctenopharyngodon idellus)

“…Studies have shown that phenolic acids [34], avonoids [35], and polysaccharides [36] inhibited the colonization of pathogenic bacteria in the intestines, increased the number of bene cial bacteria and enhanced the intestinal nutrient absorption. In grass carp, the EU active compounds such as chlorogenic acid [22], quercetin [23] and baicalein [37] have been reported to signi cantly promote the growth performance. Therefore, the growth improvement by dietary ELE is the combined effect of various active compounds.…”

“…Generally, barks contain more lignin and iridoids, while leaves contain more phenolic acids and avonoids [39]. Previous studies in our laboratory have shown that dietary phenolic acids (chlorogenic acids) [9] and avonoids (quercetin) [23] produced more positive effects on growth of grass carp than iridoids (geniposide and geniposidic acid) did [24][25].…”

“…Grass carp (Ctenopharyngodon idellus) is an important cultured freshwater sh in China with a production of 5.50 million tons in 2018 [21]. In past years, we have conducted a series trials to investigate the effects of dietary EU (bark) [9] and its active compounds including chlorogenic acid [22], quercetin [23], geniposide [24] and geniposidic acid [25] on the growth and esh quality of grass carp, but the mechanism of esh quality-improving and collagen-promoting effects is still unclear. Moreover, how about the effects of EU leaf extract when compared to EU bark extract?…”

The key role of functional aquafeeds to achieve a more sustainable aquaculture

“…This functional supplement is a flavonoid derived from milk thistle commonly used to treat liver failure and fetal diseases. Xu et al () pinpointed some positive effects of supplementing grass carp ( Ctenopharyngodon idella ) feeds with quercetin extracted from the traditional herbal medicine Eucommia ulmoides , which is also a flavonoid compound.…”