Xylanase supplementation in plant protein‐enriched diets improves growth performance by optimizing the intestinal microflora and enhancing the intestinal immune function in grass carp grow‐out ( Ctenopharyngodon idella )

Abstract

This study investigated the effect of xylanase supplementation of a plant proteinenriched diet on the growth performance and intestinal immune function of grass carp grow-out (Ctenopharyngodon idella). Five hundred forty healthy grass carp growout (232.74 ± 0.12 g) were fed diets containing graded levels of xylanase for 60 days. S U PP O RTI N G I N FO R M ATI O N Additional supporting information may be found online in the Supporting Information section. How to cite this article: Jin Y-L, Zhou X-Q, Jiang W-D, et al. Xylanase supplementation in plant protein-enriched diets improves growth performance by optimizing the intestinal microflora and enhancing the intestinal immune function in grass carp grow-out (Ctenopharyngodon idella). Aquacult Nutr. 2020;26:781-800. https ://doi.

Dietary β‐sitosterol supplementation enhanced intestinal immune function of large yellow croaker ( Larimichthys crocea ) infected with Aeromonas hydrophila

“…Aeromonas hydrophila (A. hydrophila) is a well-known pathogen found in fish culture, which led to increasingly severe outbreaks of bacterial enteritis (Mu et al, 2010). Currently, nutritional strategies, such as the use of feed additives, have been demonstrated to be efficacious in the strengthen of bacterial enteritis resistance in fish (Jin et al, 2020;Tian et al, 2017). The resistance of bacterial enteritis plement 3 and complement 4 contents as well as IgM contents (not in the proximal intestine [PI]) and up-regulated LEAP-2C (rather than LEAP-2A) and hepcidin mRNA expressions in the intestine; (3) down-regulated pro-inflammatory cytokines IL-1β (not in PI), IL-2, IL-6, IL-8, IFNγ and IFITM mRNA expressions partly associating with NF-κB signalling and up-regulated anti-inflammatory cytokines IL-4/13A (not IL-4/13B), IL-11 and TGFβ mRNA expressions partly associating with TOR signalling in the intestine.…”

“…Aeromonas hydrophila ( A. hydrophila ) is a well‐known pathogen found in fish culture, which led to increasingly severe outbreaks of bacterial enteritis (Mu et al, 2010). Currently, nutritional strategies, such as the use of feed additives, have been demonstrated to be efficacious in the strengthen of bacterial enteritis resistance in fish (Jin et al, 2020; Tian et al, 2017). The resistance of bacterial enteritis was closely connected with the intestinal immune function in fish (Rauta et al, 2012).…”

Upgrading low-quality feeds for tilapia by enzyme and probiotic supplementation

“…Despite the large range of doses, there was no effect on the ∆ digestibility of any of the measured nutrients. On the contrary, both in grass carp (Jin et al 2020) and Jian carp (Jiang et al, 2014), an optimum xylanase dose was recorded (U/kg), of around 1530 and 1260 U/kg, respectively. Above this optimum, the growth rate decreased.…”

“…However, across studies there is not a clear dose response of xylanase supplementation, despite the considerable variation in the applied doses between studies (Table 1). Likewise, where most studies show improved growth with xylanase supplementation across fish species (Dalsgaard et al, 2012;Jiang et al, 2014;Hassaan et al, 2019;Jin et al, 2020), some do not find an effect on growth at all (Wallace et al, 2016). A large range of xylanase doses were used, ranging from 2987 to 6844 U/kg (Table 1).…”