Dietary threonine requirement of fingerling Indian major carp, Cirrhinus mrigala (Hamilton)
Identifieur interne : 001143 ( Main/Merge ); précédent : 001142; suivant : 001144Dietary threonine requirement of fingerling Indian major carp, Cirrhinus mrigala (Hamilton)
Auteurs : Imtiaz Ahmed [Inde] ; Mukhtar A. Khan [Inde] ; A K Jafri [Inde]Source :
- Aquaculture Research [ 1355-557X ] ; 2004-01.
English descriptors
Abstract
Indian major carp fingerling, Cirrhinus mrigala (3.85±0.75 cm, 0.52±0.21 g), were fed isonitrogenous and isocaloric diets (40% crude protein, 4.28 kcal g−1, gross energy) containing casein, gelatin and crystalline amino acids with graded levels of l‐threonine (1.00, 1.25, 1.50, 1.75, 2.00 and 2.25 g 100 g−1, dry diet) to determine the dietary threonine requirement. The feeding trial was conducted in triplicate for 8 weeks. Diets were fed twice a day at 08:00 and 16:00 hours at 5% body weight day−1. The ration size and feeding schedule were worked out before the start of the feeding trial. Highest weight gain (304%) and best feed conversion ratio (1.43) were evident in fish fed diet containing 1.75% dietary threonine. Second‐degree polynomial regression analysis of weight gain, feed conversion ratio and protein efficiency ratio data indicated the dietary threonine requirement to be at 1.84%, 1.81% and 1.78%, respectively, corresponding to 4.60%, 4.52% and 4.45% of dietary protein. Minimum carcass moisture, fat and maximum carcass protein were evident in fish fed 1.75% threonine level. However, ash content did not affect body composition, except the 1.00% threonine level, which showed a significantly higher ash content value. Based on the above results, it is recommended that the diet for C. mrigala should contain threonine at 1.80 g 100 g−1 dry diet, corresponding to 4.50 g 100 g−1 dietary protein for optimum growth and efficient feed utilization.
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DOI: 10.1111/j.1365-2109.2004.00997.x
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The feeding trial was conducted in triplicate for 8 weeks. Diets were fed twice a day at 08:00 and 16:00 hours at 5% body weight day−1. The ration size and feeding schedule were worked out before the start of the feeding trial. Highest weight gain (304%) and best feed conversion ratio (1.43) were evident in fish fed diet containing 1.75% dietary threonine. Second‐degree polynomial regression analysis of weight gain, feed conversion ratio and protein efficiency ratio data indicated the dietary threonine requirement to be at 1.84%, 1.81% and 1.78%, respectively, corresponding to 4.60%, 4.52% and 4.45% of dietary protein. Minimum carcass moisture, fat and maximum carcass protein were evident in fish fed 1.75% threonine level. However, ash content did not affect body composition, except the 1.00% threonine level, which showed a significantly higher ash content value. Based on the above results, it is recommended that the diet for C. mrigala should contain threonine at 1.80 g 100 g−1 dry diet, corresponding to 4.50 g 100 g−1 dietary protein for optimum growth and efficient feed utilization.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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