Yeast extract on growth, nutrient utilization and haemato-immunological responses of Nile tilapia

Abstract

Dietary supplementation (0, 10, 20, 40, 60, 80 g kg−1) of a nucleotide source (NuPro®) was evaluated on growth, nutrient utilization, haemato‐immunological responses and resistance to experimental infection of Nile tilapia. Fish (2.63 ± 0.63 g) were fed experimental diets to satiation three times a day for 75 days. Feed intake increased linearly with increasing levels of NuPro® promoting higher weight gain (P < 0.05). Survival, feed conversion and protein retention were not affected. Following the growth trial, fish were challenged with Aeromonas hydrophila by intraperitoneal injection. Survival and innate immune responses (phagocytosis and lysozyme activity) were not significantly affected. However, among the haematological variables, thrombocyte, leucocyte and monocyte counts increased linearly (P < 0.05). The indirect measurement of digestibility in juvenile Nile tilapia (122.32 ± 11 g) indicated a linear decrease in protein (1.41%), dry matter (5.72%) and energy (4.10%) digestibility coefficients as dietary supplementation increased (P < 0.05). NuPro® showed to be a beneficial additive to be supplemented in diets for juvenile Nile tilapia, providing 32.8% increase in feed intake and 28.8% in weight gain, as well as in thrombocyte, leucocyte and monocyte counts in blood, possibly indicating a more efficient defence response in the highest dietary supplementation levels tested.

Yeast culture dietary supplementation modulates gut microbiota, growth and biochemical parameters of grass carp

“…() and Ran et al . () reported that dietary supplementation of yeast extract and live baker's yeast improved the growth, feed utilization and blood immunological indexes of Nile tilapia (Ran et al ., ; Berto et al ., ). It is known that antioxidant enzymes such as superoxide dismutase (SOD) and catalase (CAT) could protect against reactive oxygen species (ROS) that induced oxidative damage.…”

“…Furthermore, we also found that certain concentration of YC (Treat3 and Treat4) feeding grass carp for 10 weeks showed good growth performances including the FCR and GR. Similar results have been previously reported that yeast supplementation could also promote growth performances and immune response of human (Possemiers et al ., ), chicks (Gao et al ., ), pigs (Shen et al ., ) and fish species (Essa et al ., ; Huang et al ., ; Ran et al ., ; Berto et al ., ). For example, dietary supplemental YC at 2.5 g kg −1 on chicks distinctively improved the growth performances including the average daily gain and feed conversion (Gao et al ., ).…”

“…Similarly, yeast supplementation also exhibited a sensitive response of the hindgut microbial ecosystem in horses (Grimm et al ., ). In fish species, the feed intake and weight gain were promoted by dietary supplementation of yeast extract in Nile tilapia and a more efficient defence response to disease was shown (Berto et al ., ). Essa et al .…”

“…Similarly, yeast supplementation also exhibited a sensitive response of the hindgut microbial ecosystem in horses (Grimm et al, 2016). In fish species, the feed intake and weight gain were promoted by dietary supplementation of yeast extract in Nile tilapia and a more efficient defence response to disease was shown (Berto et al, 2016). Essa et al (2011) evaluated the effects of different additive levels of yeast on the Egyptian African catfish (Clarias gariepinus), which indicated that adding high level of yeast recorded higher final body weight and growth rate.…”

Potential of microbial‐derived nutrients for aquaculture development

“…; Berto et al . ). Given that the aquaculture industry represents a rather new activity, there are still many gaps of knowledge on the physiological effects that these new microbial‐derived ingredients promote on the aquatic organisms.…”