Search

Search Results

• Impacts of Dietary Supplementation of Peptidoglycan Extracted from Lactobacillus sp. on the Growth Performance and Resistance to Streptococcus Agalactiae of Nile Tilapia

  Nguyen Thi Mai, Mai Van Tung, Do Hoanh Quan, Vu Thi Thanh Huong, Nguyen Thu Hang

  Received: Mar 14, 2023 / Published: Jun 30, 2023

   Abstract PDF

  The current experiment aimed to determine the effects of peptidoglycan, known as a prebiotic compound, on the growth, feed efficiency, and disease resistance in Nile tilapia. Fish at an initial body weight of 22.6 ± 0.3g were distributed into a 100 L-glass tank system. Peptidoglycans extracted from Lactobacillus sp. were added to commercial feed at ratios of 0, 5, and 10 g kg-1 diet corresponding to the PG0, PG5, and PG10 treatments, respectively. Fish were then fed at 4% their body weight for four weeks. After a 4-week trial, fish were infected with Streptococcus agalactiae at 50% the lethal dose (1.1×106 CFU mL-1), and monitored for 14 days. After 2 and 4 weeks of the feeding trial (T2 and T4) and on the second day of the bacterial challenge, fish blood samples were collected for hematological analysis. The results indicated that the dietary supplementation of peptidoglycan induced a positive effect on fish growth performance and the highest value was observed in the PG5 treatment. The lowest value of cumulative mortality was also observed in the PG5-fed fish indicating that the dietary supplementation at 5 g kg-1 diet supported the highest resistance to S. agalactiae. In conclusion, the beneficial effects of dietary supplementation of peptidoglycan extracted from Lactobacillus sp. were recorded on the growth performance and disease resistance in Nile tilapia.

• Effects of Dietary Sesame Oil Supplementation on Growth Performance, Feed Utilization, and Fillet Quality in Nile Tilapia

  Nguyen Thi Mai, Tran Thi Nang Thu

  Received: Sep 28, 2024 / Accepted: Mar 21, 2025 / Published: Mar 31, 2025

   Abstract PDF

  Sesame oil is an ideal lipid source replacing the fish oil in fish diet thanks to its fatty acid profile and sensory characteristics. This study was conducted to evaluate the impacts of dietary sesame oil supplementation on growth, feed utilization, and fillet quality of Nile tilapia in growth-out stage. The basal feed for tilapia was supplemented with sesame oil at ratios of 0, 10, 20, and 40 g kg-1 corresponding to AS0, AS10, AS20, and AS40 treatments. Fish (~80g) were fed to apparent satiation for 6 weeks. Fish were weighed periodically to monitor the growth rate. At the end of the experiment, fish were dissected to collect the fillet and measure the intestinal indicators; the number of fish and amount of consumed feed served to calculate the survival rate, feed conversion ratio, and protein efficiency rate. Fillet samples were then used to analyze the fatty acid composition, chemical composition, physicochemical indicators, and sensory characteristics. The results showed that the highest value of fish growth and feed utilization were found in AS20. The sesame oil levels did not modify the intestinal parameters but changed the hardness and lightness of fish fillet. The sensory parameters including aroma and sweetness were highest in AS20 and AS40. The significant differences were recorded in total lipid and fatty acid level in fish fillet. In conclusion, the supplementation of sesame oil at 20 g kg-1 diet brings the benefits in fish growth and fillet quality of Nile tilapia in growth-out stage from 80 to 300 g/fish.