Corn distiller's dried grains with solubles: Apparent digestibility and digestive enzymes activities in European seabass (Dicentrarchus labrax) and meagre (Argyrosomus regius)

Abstract

Corn distillers dried grains with solubles (DDGS) is a co-product of corn ethanol production which biological value is dependent on technological processes and so may be highly variable among production plants. Therefore, two digestibility trials were conducted to evaluate the apparent digestibility coefficients (ADCs) of nutrients and energy of two commercial sources of DDGS and their effects on digestive enzyme activities in European seabass and meagre juveniles. DDGS digestibility was determined based on the substitution of 30% of a reference diet (45% CP; 16% CL) by each test DDGS. ADCs of protein (92-98%), most amino acids (75-99%) and lipids (82-89%) were high while that of energy (58-68%) was low, reflecting the high indigestible fiber content of DDGS. ADCs of nutrients and energy of DDGS were similar in both species, except for some amino acids (lysine, arginine, histidine, isoleucine, tyrosine and aspartic acid) which were higher for seabass than for meagre. Independent of fish species, ADCs of protein and energy were higher in DDGS 1 than in DDGS 2 , whereas ADCs of lipids and most amino acid were not affected by DDGS source. Digestive enzymes activities were species specific: protease activity was higher in meagre while lipase and amylase activities were higher in seabass. For both species, all digestive enzymes activities were higher in mid intestine than in anterior or distal intestine. Overall, it is concluded that corn DDGS is well digested and seems to have high potential for inclusion in diets for seabass and meagre juveniles.

Nutritional value of dry‐extruded blends of seafood processing waste and plant‐protein feedstuffs in diets for juvenile red drum ( Sciaenops ocellatus , L.)

“…It is widely known that carnivorous fish poorly digests complex non‐starch polysaccharides, and red drum is not an exception (Gatlin, ; NRC, ). Similar results for energy digestibility of DDGS were reported for European seabass ( Dicentrarchus labrax ) and meagre ( Argyrosomus regius ; Magalhães et al, ).…”

Black soldier fly (Hermetia illucens) pre-pupae meal as a fish meal replacement in diets for European seabass (Dicentrarchus labrax)

“…Even though amylase, lipase, and proteases are secreted into the anterior section of the intestine, and therefore their activity is expected to be higher in that portion of the intestine, this was not the case in the present or other studies (Magalhães et al, 2015;Pérez-Jiménez et al, 2009). Digestive enzyme activities and digesta transit time along the gastrointestinal tract may be affected by diet composition (Castro et al, 2013(Castro et al, , 2015Pérez-Jiménez et al, 2009), and our results also seem to indicate a drag of secreted enzymes to the posterior intestine rather than an increased activity of these enzymes in this intestinal portion.…”

“…Total protease activity was higher than amylase and lipase activities, as has been observed previously with seabass (Magalhães et al, 2015). Even though amylase, lipase, and proteases are secreted into the anterior section of the intestine, and therefore their activity is expected to be higher in that portion of the intestine, this was not the case in the present or other studies (Magalhães et al, 2015;Pérez-Jiménez et al, 2009).…”

Wheat germ as an alternative ingredient to a fair average quality fishmeal in diets for European seabass

“…Commercial-sized European seabass fed on diets where FM was substituted by a PP blend (corn and wheat gluten) showed no differences on dry matter and nutrient digestibility, even at high replacement levels (Kaushik et al, 2004). In the present study, dry matter ADC of the control diet was already high ( (Magalhães et al, 2015). Lower dry matter and energy digestibility were attributed to high indigestible fibre content of DDGS products.…”

“…CSG lower protein digestibility could be due to the presence of antinutritional factors such as tannins (Alexis, ). Furthermore, reduced dry matter and energy ADCs were reported in European seabass fed diets where 30% FM was replaced by corn distiller's dried grains with solubles (DDGS) (Magalhães et al, ). Lower dry matter and energy digestibility were attributed to high indigestible fibre content of DDGS products.…”