Effects of Dietary Supplementation of DL-Methionine on Growth and Whole Body Amino Acid Profile of Genetically Improved Farmed Tilapia

Sunflower meal as an alternative protein source to replace soybean meal in the diet of GIFT strain of Nile tilapia Oreochromis niloticus

“…In this study, dietary supplementation of SFM significantly affected the whole body protein, ash and moisture contents in GIFT tilapia, which might be due to the changes in protein source in the dietary treatments. Similar to the results of this study, Prabu et al (2019) observed significant differences in the whole body protein content of GIFT tilapia fed graded levels of DL-methionine supplemented diets. Infact, changes in the protein source as well as amino acid pattern of the diet also had great impact on the influence of whole body chemical composition.…”

“…In European seabass, Spyridakis et al (1988) found similar results with diets containing soybean meal. With regard to whole body amino acid composition of GIFT tilapia, Prabu et al (2019) documented significant differences in whole body lysine, methionine and tryptophan. The study of Furuya et al (2000) found that, increasing sunflower meal in tilapia diets bring a quadratic effect (p<0.05) on PER of Nile tilapia.…”

Optimizing amino acid balance in fish meal‐free diets for GIFT strain of Nile tilapia ( Oreochromis niloticus ) by deletion method

“…The –AA diet was formulated using plant‐based ingredients without supplementation of crystalline amino acids. The balanced diet (BD) was formulated based on the findings of our previous studies (Prabu et al, 2019; Prabu, Felix, Uma, Ahilan, et al, 2020; Prabu, Felix, Uma, & Praveenraj, 2020) with supplementation of DL‐methionine, L‐lysine, L‐tryptophan and L‐arginine. The other diets were formulated by the deletion technique, in which the BD was diluted with cassava starch resulting in a reduction in each amino acid, such as methionine (‐Met), lysine (‐Lys), tryptophan (‐Trp) and arginine (‐Arg) (Table 1).…”

“…Therefore, it is essential to frequently validate and update the nutritional requirement levels of tilapia in order to meet their new genetic demands. In this context, the authors carried out studies and found that the optimum level of methionine, lysine, tryptophan and arginine were 9.0 g/kg (Prabu et al, 2019), 18.3 g/kg (Prabu et al, 2020), 3.8 g/kg (Prabu et al, 2020) and 16.7 g/kg of diet, respectively, for attaining better growth performance in GIFT tilapia.…”

Effects of three methionine sources in diets on temporal B0AT1 and ASCT2 mRNA expression in different intestinal segments of cobia, Rachycentron canadum

“…The DL‐Met form is chemically identical to L‐Met but is combined with a form that has a different spatial orientation (mirror image). Crystalline DL‐Met has been successfully used to improve the growth of fish, such as Nile tilapia, Oreochromis niloticus (Prabu, Felix, Ahilan, Antony, & Uma, 2019); turbot, Scophthalmus maximus L. (Gao et al, 2019); and Chinese soft‐shelled turtle, Pelodiscus sinensis (Xiao, Wang, Liu, Ju, & Zhan, 2017). In recent years, coated Met (Co‐Met) has been added to animal feed because of the high utilization of Met, especially in the aquaculture industry.…”