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Effects of Microencapsulated Saccharomyces cerevisiae on Growth, Hematological Indices, Blood Chemical, and Immune Parameters and Intestinal Morphology in Striped Catfish, Pangasianodon hypophthalmus

Boonanuntanasarn, Surintorn, Ditthab, Khanittha, Jangprai, Araya, Nakharuthai, Chatsirin
Probiotics and antimicrobial proteins 2019 v.11 no.2 pp. 427-437
Pangasianodon hypophthalmus, Saccharomyces cerevisiae, albumins, aquaculture, blood, calcium, cholesterol, complement, experimental diets, feed conversion, feed supplements, fish feeds, freeze drying, glucose, growth performance, guar gum, immunoglobulins, intestines, iron, lysozyme, magnesium, microencapsulation, phosphorus, probiotics, proximate composition, triacylglycerols, urea nitrogen, villi
This study investigated the effects of dietary probiotic Saccharomyces cerevisiae in the striped catfish, Pangasianodon hypophthalmus, which is an important aquaculture species. Freeze-dried microencapsulated probiotic S. cerevisiae with guar gum was performed and used for fish feed supplementation. Striped catfish were fed for 120 days with one of three experimental diets: basal diet (control), basal diet supplemented with 10⁶-CFU S. cerevisiae g⁻¹ diet (S. cerevisiae 10⁶), and basal diet supplemented with 10⁸-CFU S. cerevisiae g⁻¹ diet (S. cerevisiae 10⁸). The S. cerevisiae-supplemented diets significantly improved growth performance including growth rate and feed conversion ratio over 120 days of culture period (P < 0.05). The rate of survival was similar in all experimental groups. Supplementation with S. cerevisiae did not significantly affect whole body proximate composition (P > 0.05). In addition, probiotic S. cerevisiae had no effects on hematological indices and blood chemistry values (glucose, cholesterol, triglycerides, protein, albumin, blood urea nitrogen, chloride, calcium, magnesium, iron, and phosphorus) (P > 0.05). However, dietary S. cerevisiae led to increases in humoral immune parameters including total immunoglobulin, lysozyme, and alternative complement activities (P < 0.05). Dietary S. cerevisiae led to increase intestinal villus height in the anterior part of intestine (P < 0.05). Taken together, while the dietary S. cerevisiae had no detectable effects on hematological indices and several metabolic indicators, significant beneficial probiotic effects were observed on rates of growth, feed conversion ratio, and immune parameters.