Faba bean meal (FBM) was used to replace soybean meal (SBM) in different proportions, and its impacts on muscle fatty acid composition, flesh quality, and myogenic regulatory factors (MRFs) expression in grass carp (Ctenopharyngodon idella) were evaluated. Five isonitrogenous (33.7% crude protein) and isolipidic (4.1% crude lipid) diets containing different levels of FBM replacing dietary SBM (0, 9, 18, 27, and 36%) were formulated and were randomly assigned to triplicate groups of fish (mean initial weight of 3.39 ± 0.01 g) for 8 weeks. No significant differences were observed between the 0% group and FBM‐supplemented groups (except for 36% group). FBM instead of SBM significantly influenced the fatty acid composition and expression of MRFs, and markedly enhanced shear force and some texture parameters in muscle. Strong correlation was observed between MRFs and flesh textural properties. The maximal proportion of dietary SBM replacement with FBM was estimated to be 28.97% based on weight gain using a quadratic broken‐line model. These results indicated that FBM supplementation might affect flesh quality by regulating expression of some MRFs. The substitution proportion of SBM with FBM in diets of grass carp was 28.97% based on the situation described in this study.

中文翻译：

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草鱼（Ctenopharyngodon idella）日粮中的蚕豆粉被大豆粉部分替代，以及对肌肉脂肪酸组成，肉质和成肌调节因子表达的影响

用蚕豆粉（FBM）替代不同比例的豆粕（SBM），它对草鱼（Ctenopharyngodon idella）中肌肉脂肪酸组成，肉质和肌调节因子（MRFs）表达的影响）进行了评估。配制了五种含氮量不同的FBM替代日粮SBM（0、9、18、27和36％）的等氮饲料（33.7％粗蛋白）和等脂饲料（4.1％粗脂肪），并随机分为三组（平均初始重量为3.39±0.01克），持续8周。在0％组和补充FBM的组之间（36％组除外）没有观察到显着差异。用FBM代替SBM显着影响脂肪酸的组成和MRF的表达，并显着增强肌肉的剪切力和某些纹理参数。观察到MRF与肉的质地特性之间存在很强的相关性。根据体重增加，使用二次折线模型估算，饮食中以SBM替代SBM的最大比例为28.97％。这些结果表明，补充FBM可能通过调节某些MRF的表达来影响肉质。根据本研究的情况，草鱼日粮中SBM替代FBM的比例为28.97％。