Saccharomyces cerevisiae increases the acceptability of Nile tilapia (Oreochromis niloticus) to date palm seed meal

Mahmoud A.O. Dawood, Nabil M. Eweedah, Malik M. Khalafalla, Ahmed Khalid, Amel El Asely, Sabreen E. Fadl, Aziza A. Amin, Bilal Ahamad Paray, Hamada A. Ahmed
2020 Aquaculture Reports  
A B S T R A C T Varied levels of Saccharomyces cerevisiae-fermented date palm seed meal (DSM) were included in Nile tilapia (26.95 ± 0.01 g) diets. Five diets were prepared to include fermented DSM at 0, 5, 10, 15 and 20 % and fed for fish for 8 weeks. The obtained results revealed that yeast fermented DSM significantly affected the final body weight, weight gain, specific growth rate, and feed conversion ratio in a dose dependent manner (P = 0.001, P = 0.002, P = 0.004, P = 0.01,
more » ... 0.01, respectively). Dietary yeast fermented DSM significantly increased the lipase, amylase, and protease activities (P = 0.011, P = 0.02, P = 0.031, respectively). In the anterior segment of the intestine, villus length and the number of goblet cells were significantly affected by the inclusion of yeast fermented DSM (P = 0.001 and P = 0.008). In the middle area, only the villus length, internal villi distance, and goblet cells number were affected significantly by the inclusion of yeast fermented DSM (P = 0.001, P = 0.02, P = 0.047, respectively). Posterior intestinal morphometry showed significantly increased villus length and number of goblet cells when fish fed yeast fermented DSM in a dose dependent manner (P = 0.028 and P = 0.04). Most of the measured blood parameters showed insignificant (P > 0.05) differences except for total blood protein, globulin, albumin, RBCs, and WBCs which were significantly affected by the inclusion of yeast fermented DSM (P = 0.001, P = 0.001, P = 0.007, P = 0.042, P = 0.001, respectively). Furthermore, dietary yeast fermented DSM significantly altered the lysozyme and phagocytic activities (P = 0.03 and P = 0.005). Based on the polynomial regression analysis the inclusion of yeast fermented DSM at 11.44-17.44 % can be used effectively in tilapia' diets for improving the growth, digestion activity, and immune response.
doi:10.1016/j.aqrep.2020.100314 fatcat:hhhxt7n2fnaajpzij3olcp24n4