<abstract xmlns="http://www.w3.org/1999/xhtml">

The study herein evaluated the effects of dietary supplementation with different yucca (<italic>Yucca schidigera</italic>) extract levels on rearing water quality, growth performance, protein utilization, hematological and immunological status, and economic benefits of cultured European seabass (<italic>Dicentrarchus labrax</italic>) juveniles. Yucca extract (YE) was incorporated in an experimental diet at levels of 0, 0.25, 0.50, and 1 g YE kg−1, and offered to fish reared in 70-L glass aquaria (15 fish per aquarium; three replicates each). Dietary YE supplementation significantly (P&lt;0.05) decreased ammonia-nitrogen levels in water. Compared with the control, groups fed 0.50 and 1 g YE kg−1 diets showed improved growth performance (by 26.02% and 36.98%, respectively) and protein efficiency ratio (by 31.39% and 37.29%, respectively). In addition, hematological parameters (red blood cells, hemoglobin, hematocrit, white blood cells and neutrophil) and innate immune parameters (globulin fractions and lysozyme activity) improved with increasing dietary YE levels. Growth, hematological, and immunological parameters increased with a polynomial second-order regression models, with curves peak close to 1 g YE kg−1 diet. The cortisol level decreased significantly (P&lt;0.05) with increasing dietary YE levels. The groups fed the 0.50 and 1 g YE kg−1 diets generated significantly (P&lt;0.05) higher revenue than groups fed the 0.25 g YE kg−1 and the control diets. The using of YE is recommended as a dietary feed additive at a level of 1 g kg−1 for reducing the environmental footprint of fish protein production, accelerating growth, and improving health status of cultured seabass in a short-term feeding period.
</abstract>

The study herein evaluated the effects of dietary supplementation with different yucca (Yucca schidigera) extract levels on rearing water quality, growth performance, protein utilization, hematological and immunological status, and economic benefits of cultured European seabass (Dicentrarchus labrax) juveniles. Yucca extract (YE) was incorporated in an experimental diet at levels of 0, 0.25, 0.50, and 1 g YE kg−1, and offered to fish reared in 70-L glass aquaria (15 fish per aquarium; three replicates each). Dietary YE supplementation significantly (P<0.05) decreased ammonia-nitrogen levels in water. Compared with the control, groups fed 0.50 and 1 g YE kg−1 diets showed improved growth performance (by 26.02% and 36.98%, respectively) and protein efficiency ratio (by 31.39% and 37.29%, respectively). In addition, hematological parameters (red blood cells, hemoglobin, hematocrit, white blood cells and neutrophil) and innate immune parameters (globulin fractions and lysozyme activity) improved with increasing dietary YE levels. Growth, hematological, and immunological parameters increased with a polynomial second-order regression models, with curves peak close to 1 g YE kg−1 diet. The cortisol level decreased significantly (P<0.05) with increasing dietary YE levels. The groups fed the 0.50 and 1 g YE kg−1 diets generated significantly (P<0.05) higher revenue than groups fed the 0.25 g YE kg−1 and the control diets. The using of YE is recommended as a dietary feed additive at a level of 1 g kg−1 for reducing the environmental footprint of fish protein production, accelerating growth, and improving health status of cultured seabass in a short-term feeding period.

<italic>Yucca schidigera</italic> Extract Dietary Supplementation Affects Growth Performance, Hematological and Physiological Status of European Seabass

Animal and Fish Production Department, College of Agricultural and Food Sciences

Department of Fish and Animal Production, Faculty of Agriculture (Saba Basha)

Department of Fish and Animal Production, Faculty of Agriculture (El-Shatby)

Annals of Animal Science

This work is licensed under the Creative Commons Attribution 4.0 International License.

 Extract Dietary Supplementation Affects Growth Performance, Hematological and Physiological Status of European Seabass

The study herein evaluated the effects of dietary supplementation with different yucca (Yucca schidigera) extract levels on rearing water quality, growth...

Yucca schidigera Extract Dietary Supplementation Affects Growth Performance, Hematological and Physiological Status of European Seabass

Publicado en línea: 05 ago 2021

Páginas: 1043 - 1060

Recibido: 02 oct 2020

Aceptado: 20 ene 2021

DOI: https://doi.org/10.2478/aoas-2021-0007

Palabras clave
growth performance, hematological, immunological status, water quality, Yucca schidigera extract

© 2021 Abdallah Tageldein Mansour et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Yucca schidigera Extract Dietary Supplementation Affects Growth Performance, Hematological and Physiological Status of European Seabass

Publicado en línea: 05 ago 2021

Páginas: 1043 - 1060

Recibido: 02 oct 2020

Aceptado: 20 ene 2021

DOI: https://doi.org/10.2478/aoas-2021-0007

Palabras clavegrowth performance, hematological, immunological status, water quality, Yucca schidigera extract

© 2021 Abdallah Tageldein Mansour et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Palabras clave
growth performance, hematological, immunological status, water quality, Yucca schidigera extract