Effects of feed processing and forms of dietary methionine on growth and IGF-1 expression in Jian carp

Abstract

In this study, a practical basal diet (control, C) was supplemented with crystal methionine (Met) (CM) or encapsulated Met (EM), and then was pelleted (P) or extruded (E) to form six diets, PC, PCM, PEM, EC, ECM and EEM. The six diets were fed to Jian carp with initial body of 8.6 AE 0.4 g for 8 weeks to evaluate the effects of Met supplementation and feed processing on growth of the fish. In pelleted diets, weight gain (WG) increased and feed conversion ratio (FCR) decreased (P < 0.05) in response to the supplementation of EM, but both WG and FCR were not affected by the supplementation of CM in the pelleted diet, when compared with PC group. In extruded diets, WG of fish fed ECM or EEM diets was higher and FCR was lower (P < 0.05) than those of fish fed EC diet. In the pelleted diets, the highest level of serum free Met was observed at the 1st, 2nd and 3rd h after feeding for PCM, PEM and PC group, respectively, but the three extruded diet groups showed the same peaking time at the 3rd h after feeding. In both pelleted and extruded diets, the supplementation of EM increased the expression of IGF-1 gene in muscle (P < 0.05) when compared to PC and EC respectively. Results above indicated that the growth of Jian carp can be improved by the supplementation of EM in pelleted diet, or by the supplementation of EM, CM in extruded diet deficient in Met, but not by the supplementation of CM in pelleted diet.

Comparative study on the utilization of crystalline methionine and methionine hydroxy analogue calcium by Pacific white shrimp (Litopenaeus vannamei Boone)

“…() showed that the growth and feed utilization of Pacific white shrimp were supported by MHA‐Ca supplementation when 150.0 g/kg of fish meal was replaced by soybean meal and other ingredients, at 50% and 100%. Dietary MHA‐Ca has been reported to promote the growth of hybrid striped bass ( Morone chrysops × M. saxatilis ) (Savolainen & Gatlin, ), Jian carp (Shan et al., ) and channel catfish (Zhao et al., ). The present study also showed that the supplementation of MHA‐Ca (0.1%) significantly increased WGR and reduced FCR of shrimp when compared to NC group.…”

Comparative study on the utilization of different methionine sources by channel catfish, Ictalurus punctatus (Rafinesque, 1818)

“…MHA-Ca is the combination form of calcium and MHA. Studies showed that hybrid striped bass (Savolainen & Gatlin 2010) and Jian carp (Shan et al 2015) can effectively utilize the supplemental MHA-Ca in diet. In the present study, the WG was significantly improved by the supplemental MHA-Ca, but not by the supplemental MHA when compared with the NC group, which indicated that MHA-Ca but not MHA could be effectively utilized as Met source by channel catfish.…”

“…The studies on the biological activity of MHA‐Ca were limited in aquatic animals, and the few results showed that the growth of hybrid striped bass ( Morone chrysops × M. saxatilis ) (Savolainen & Gatlin ) and Jian carp ( Cyprinus carpio var. Jian) (Shan, Li, Zheng, Zhao & Leng ) was significantly improved by the addition of MHA‐Ca. However, there is lack of information on the application of MHA‐Ca in channel catfish diet.…”

Additional feeding of vitamin–mineral‐based nutraceutical to stress‐exposed rohu, Labeo rohita, enhances the IGF‐1 gene expression and growth

“…Additionally, long‐term feeding trial confirmed the growth‐promoting effect of dietary zinc in common carp (Ogino & Yang, 1979) through the mechanism of zinc–gene interaction and protein synthesis as suggested by Chesters (1991). Moreover, Shan et al (2017) had reported that dietary supplementation of encapsulated methionine improved the overall growth and IGF‐1 expression in Jian carp.…”