Effect of soybean waste fermented by Saccharomyces cerevisiae on growth performance, hematological parameters, liver enzyme functions, and immunity of Vietnamese native chickens https://doi.org/10.12982/VIS.2026.049
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Abstract
Fermented soybean waste (FSW), produced by fermentation by Saccharomyces cerevisiae, has emerged as a promising feed ingredient for poultry because of its potential to improve growth performance, health, and immune responses. This study aimed to evaluate the effects of dietary supplementation with FSW at various levels on growth performance, serum biochemistry, liver enzyme activity, and antibody titers against Newcastle disease in Vietnamese native chickens (Noi chickens). A total of 128 native chickens were assigned to four dietary treatments: control (0% FSW), 10% FSW (S1), 20% FSW (S2), and 30% FSW (S3). Each treatment was replicated four times. The experiment was conducted in mice between 5 and 12 weeks of age. Chickens in the S3 group showed higher body weights and average daily weight gain during weeks 5–9, along with an improved feed conversion ratio (p < 0.05). Serum biochemical and liver enzyme profiles remained within physiological ranges and did not differ significantly among treatments, indicating no adverse metabolic or hepatic effects. Newcastle disease virus antibody titers were elevated in S3 at 28 and 42 days of age (p < 0.05), suggesting a relatively enhanced early and sustained immune response compared to the control. By day 56, the antibody titers were no longer different among the groups (p > 0.05), suggesting a transient immunomodulatory effect. In conclusion, dietary inclusion of FSW, particularly at 30%, improved growth performance and immune responses in native chickens without negatively affecting liver or metabolic health.
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