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Dietary lysine requirement of genetically improved farmed tilapia (GIFT) juvenile reared in inland saline water of 10 ppt salinity.

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Title Dietary lysine requirement of genetically improved farmed tilapia (GIFT) juvenile reared in inland saline water of 10 ppt salinity.
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Creator Not Available
 
Subject Amino acids GIFT Inland saline water Lysine Nutritional requirement
 
Description Not Available
A 60-day feeding trial was conducted to optimize the dietary lysine (LYS) requirement of juvenile genetically
improved farmed tilapia (GIFT) reared in inland saline water (ISW) of 10 ppt salinity. Seven isonitrogenous (370
g crude protein/kg), isolipidic (80 g crude lipid/kg) and isocaloric (16.66 MJ digestible energy/kg) purified diets
were formulated and prepared with graded LYS levels viz., 12.3 (L12.3), 14.7 (L14.7), 17.2 (L17.2), 19.6 (L19.6),
22.3 (L22.3), 24.8 (L24.8) and 27.2 g/kg (L27.2). GIFT juveniles (mean weight 3.16 ± 0.01 g, 315 numbers)
were randomly allocated in triplicate into seven distinct groups following a completely randomized design. The
juveniles were fed three times daily to apparent satiation level with the respective experimental diet. The results
indicated that growth and nutrient utilization parameters were significantly (p < 0.05) altered by the various
dietary LYS levels. These parameters exhibited an increasing trend from lowest dietary LYS level (12.3 g/kg) to
19.6 g/kg dietary LYS, and subsequent additional dietary LYS supplementation showed a declining trend.
Significantly greater final weight, weight gain percentage, specific growth rate, protein efficiency ratio, apparent
net protein retention and lower feed conversion ratio were found in the 19.6 g/kg LYS fed group than other
groups. Different levels of LYS inclusion did not affect (p > 0.05) the body indices, survival and whole-body
moisture and ash content of fish. An increment in dietary LYS up to 19.6 g/kg resulted in an increase in
whole-body protein level and a decline in lipid level. The whole-body essential amino acid compositions of ju-
veniles were not changed with various dietary LYS levels, whereas the non-essential amino acids increased with
increasing dietary LYS levels up to 19.6 g/kg and decreased thereafter. Juveniles fed with high LYS containing
diets exhibited higher aspartate aminotransferase and alanine aminotransferase activities, while digestive
enzyme activities were unaffected. Serum protein, albumin, globulin, hemoglobin and white blood cell count
changed with various dietary LYS levels. Based on broken-line linear and second-order polynomial regression
analysis, the optimal dietary LYS requirements range was found to be 19.3–20.7 g/kg of the diet for GIFT juvenile reared in ISW of 10 ppt salinity.
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Date 2023-05-16T02:56:02Z
2023-05-16T02:56:02Z
2022-04-03
 
Type Journal
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/77293
 
Language English
 
Relation Not Available;
 
Publisher Elsevier