Ngày nhận bài: 27-02-2014
Ngày duyệt đăng: 26-04-2014
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ƯỚC TÍNH NHU CẦU AXIT AMIN THIẾT YẾU CỦA CÁ TRÊ LAI GIỐNG (Clarias macrocephalusx C. gariepinus) DỰA VÀO PROTEIN LÝ TƯỞNG
,
Lê Đức Ngoan
2
,
Jan Erik Lindberg
3
Từ khóa
Axit amin thiết yếu, lysine, protein lý tưởng, thành phần axit amin thiết yếu của cơ
Tóm tắt
Nhu cầu các axit amin thiết yếu của cá trê lai giống (Clarias macrocephalus x C. gariepinus) đã được ước tính dựa vào protein lý tưởng trên cơ sở xác định mức lysine tối ưu, thành phần và hàm lượng các axit amin trong mô toàn bộ cơ thể cá trê lai giống. Thí nghiệm đã được tiến hành trong bể kính thể tích 130 L, mỗi bể thả 30 cá giống (4,0 ± 0,7 g) nuôi với khẩu phần bán tinh khiết có năng lượng 18,3 MJ GE kg-1 và 300 g CP kg-1 thức ăn (CP-protein thô). Thí nghiệm có 6 nghiệm thức ứng với 6 mức lysine (40, 45, 50, 55, 60 và 65 g kg-1 CP) với 3 lần lặp. Kết quả cho thấy tăng khối lượng (WG) và tốc độ tăng trưởng đặc biệt (SGR) tăng theo mức lysine tăng trong khẩu phần (P<0,05). Thông qua phương trình đa thức bậc hai giữa WG với lysine, nhu cầu lysine được xác định là 58,2 g kg-1 CP. Nhu cầu các axit amin thiết yếu còn lại được ước tính dựa vào protein lý tưởng.
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