Ảnh hưởng của Beta- glucan và một số chất bổ sung lên sinh trưởng, tỷ lệ sống, sức đề kháng bệnh do vi khuẩn Flovobacterium Columnare trên cá rô phi giống (OREOCHROMIS NILOTICUS)

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Tác giả: Văn Vạn Kim, Việt Dũng Lê, Đình Hoài Trương

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học kỹ thuật Thú y, 2020

Mô tả vật lý: tr.45

Bộ sưu tập: Metadata

ID: 330520

Thêm vào giỏ Liên kết toàn văn

Ảnh hưởng của β-glucan và chất bổ sung vào thức ăn đến sinh trưởng, tỷ lệ sống, hệ số chuyển đổithức ăn (FCR) và sức đề kháng vi khuẩn F. columnare của cá rô phi (O. niloticus) hương (1,0±0,92 g/con)đã được thử nghiệm, đánh giá tại khoa Thủy sản, Học viện Nông nghiệp Việt Nam. Hai lô cá thí nghiệmcho ăn thức ăn có bổ sung β-glucan (NT1), hỗn hợp vitamin Chito-aqua (NT2) và lô cá đối chứng (ĐC)được ương nuôi trong 9 bể, thể tích của mỗi bể là 9,6 m3 (2x4x1,2m). Kết quả nghiên cứu cho thấy sau 2tuần cho ăn thức ăn có bổ sung hỗn hợp vitamin (Chito-aqua), cá rô phi có tốc độ sinh trưởng là 0,264 g/con/ngày và FCR là 0,84
trong khi đó cá ở lô thí nghiệm cho ăn thức ăn bổ sung β-glucan có tốc độ sinhtrưởng và FCR lần lượt là 0,235 g/con/ngày và 0,93
còn tốc độ sinh trưởng và FCR của cá ở lô đối chứnglà 0,228 g/con/ngày và 0,95. Như vậy, cá ở lô NT2 có tốc độ sinh trưởng cao nhất và FCR thấp nhất. Kếtquả gây bệnh thực nghiệm cho thấy thời gian xuất hiện cá nhiễm bệnh của cá ở lô NT1, NT2 và ĐC(+) là84,5h
70h và 44h. Tỷ lệ cá bị bệnh, chết ở lô NT1, NT 2 và ĐC (+) là 18,5
26,44 và 35,34%. Hiệu quảđiều trị cho cá khỏi bệnh ở lô NT1, NT2 và ĐC (+) là 80,1%
70,6% và 60,2% .Từ đó rút ra kết luận rằngcá ở lô NT1 có sức đề kháng với vi khuẩn F. columnare cao hơn cá ở lô NT2 và ĐC (+)This study was conducted in Fishery Faculty, Viet Nam National University of Agriculture to evaluate the effects of ß-glucan and some vitamins supplementing in feed on growth, survival rate, feed conversion ratio (FCR) and resistance to F. columnare of tilapia (O. niloticus) fry at the size of 1.0 ±0.92 g/fish. The tilapia fry were allocated in 3 groups (2 experimental groups and control group). The fish in experimental group 1 were fed with ß-glucan supplementing in feed
the fish in experimental group 2 were fed with vitamins Chito-aqua supplementing in feed and the fish in control group were fed with normal feed only. The experimental results showed that after 2 weeks of experiment, the growth rate of fish in the experimental group 2 was 0.264 g/fish/day, FCR was 0.84
meanwhile, the growth rate of fish in experimental group 1 was 0.235 g/fish/day, FCR was 0.93 and in control group was 0.228 g/fish/day
FCR was 0.95. This proved that the growth rate of fish in the experimental group 2 was faster with lower FCR in comparison with the growth rate of fish and FCR in other groups. The result of experimental infection with F. columnare showed that after experimental infection, the fish in experimental group 1, 2 and control group (+) were infected with F. columnare at hour 84th and a half, 70th and 44th, respectively. The rate of diseased and death fish in experimental group 1, 2 and control group (+) was 18.5%
26.44% and 35.34%, respectively
and the rate of recovery fish in treatment in experimental group 1, 2 and control group (+) was 80.1%, 70.6% and 60.2%, respectively. This was concluded that the resistance level with F. columnare of fish in the experimental group 1 was highest.

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