Ảnh hưởng bổ sung Grobiotic(R)-A trong thức ăn lên tăng trưởng và sức đề kháng bệnh của cá tra (Pangasianodon hypothalamus)

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Tác giả: Thị Ngọc Anh Nguyễn, Thị Tuyết Ngân Phạm

Ngôn ngữ: vie

Ký hiệu phân loại: 612.803 Human physiology

Thông tin xuất bản: Khoa học (Đại học Cần Thơ), 2018

Mô tả vật lý: 115-119

Bộ sưu tập: Metadata

ID: 491978

Thêm vào giỏ

Nghiên cứu được thực hiện nhằm đánh giá ảnh hưởng của các mức bổ sung Grobiotic(R)-A trong thức ăn đối với tăng trưởng và sức đề kháng bệnh của cá tra (Pangasianodon hypothalamus). Bốn nghiệm thức thức ăn chứa Grobiotic(R)-A khác nhau bao gồm 0% (đối chứng), 1%, 2% và 4% với 5 lần lặp lại. Cá tra có khối lượng trung bình 15,1+-2,79g được nuôi ở mật độ 80 con/bể trong hệ thống bể composite 500 L trong thời gian 60 ngày. Kết quả cho thấy tốc độ tăng trưởng của cá được cho ăn thức ăn có bổ sung Grobiotic(R)-A tốt hơn có ý nghĩa thống kê (p,0,05) so với nhóm cá ăn thức ăn đối chứng. Không có sự khác biệt thống kê (p>
0,05) về tăng trưởng giữa các nghiệm thức thức ăn ổ sung từ 1% đến 4% Grobiotic(R)-A. Hệ số chuyển hóa thức ăn ở nghiệm thức 4% Grobiotic(R)-A là thấp nhất và khác biệt có ý nghĩa thống kê so với các nghiệm thức khác. Ngoài ra, sau 21 ngày gây cảm nhiễm, nghiệm thức 4% Grobiotic(R)-A cho kết quả tốt nhất về kháng bệnh xuất huyết do vi khuẩn Aeromonas hydrophyla gây ra có thể được xem là mức bổ sung thích hợp trong thức ặn cho cá tra.The study was conducted to assess the effects of different supplementation level of Grobiotic®-Ain the diet for growth and disease resistance of catfish (Pangasianodon hypothalamus). Four experimental diets were formulated to contain different GroBiotic®-A levels namely 0% (control), 1%, 2% and 4%. Five replicate groups of fish (80 fish per 500 L tank with an average body weight of 15.14±2.79 g) were assigned to each diet for 60 days. Results showed that growth rate of fish fed diets containing GroBiotic®-A were significantly higher (p0.05) in growth performance among diets containing between 1% and 4% GroBiotic®-A. Feed conversion ratio in the 4% GroBiotic®-A treatment was lowest and statistically different from the control and the 1% and 2% GroBiotic®-A groups. Moreover, after 21 days of challenge test, the 4% GroBiotic®-A diet gave the best resistance against hemorrhagic disease caused by bacteria Aeromonas hydrophyla that could be considered a suitable level for catfish diet.

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