Đánh giá ảnh hưởng của thảo dược lên men bổ sung vào thức ăn lên tăng trưởng, khả năng sử dụng thức ăn và kháng bệnh ở cá chép (<i>Cyprinus carpio</i>)

Abstract

ABSTRACT

The study was conducted to evaluate the effects of fermented herbal (FH) product supplementations on the growth, feed utilization, and disease resistance in common carp (Cyprinus carpio). Juvenile carp (~25g/fish) were fed diets supplemented with the product at 0, 2, 5, and 10g/kg feed (designated as FH0, FH2, FH5, and FH10, respectively) for 6 weeks, with daily feed recording. At the end of the experiment, the fish were weighed to determine the growth and feed utilization. The fish were then challenged with Aeromonas veronii at the LD50 dose (4,8×10⁷ CFU/mL) and mortality was recorded daily for 14 days. The results showed that the supplementation did not affect growth, feed utilization, or survival rates. However, the supplementation of FH at 10g/kg feed induced changes in liver size and intestinal length. The fermented herbal product enhanced resistance against A.veronii. The lowest mortality after infection (10%) was observed in the group fed 5g/kg feed.

Keywords: Fermented herbs, Aeromonas veronii, common carp, disease resistance