Gelatinized and non-gelatinized corn starch based diet influence the fatty acid profile in the liver of tropical freshwater fish, labeo rohita

Abstract

Sixty days feeding trial was conducted to study the influence of gelatinized (G) to non-gelatinized (NG) starch ratio in the diet on fatty acids profiles and lipid profile in Labeo rohita fingerlings. Two hundred and thirty four fingerlings (average weight 2.53 ± 0.04 g) were randomly distributed into six treatments with each of three replicates. Six semi purified diets either containing NG and/or G cornstarch (42.4%) were fed to respective group. Total saturated fatty acids in liver increased with the increasing level of G starch in the diet whereas reverse trend observed for monounsaturated fatty acids. Total n-3 fatty acids decreased linearly with the increasing level of G starch in the diet. Among the n-3 fatty acids linolenic acids content was more in NG starch fed group. Similarly, eicosapentaenoic acid contents gradually decreased with increasing level of G starch content. The n-6/n-3 ratio was higher in G starch fed groups compared to NG starch fed group. Total lipid content and triglyceride levels in muscle and liver increased linearly with the increasing level of G starch, whereas phospholipid and cholesterol level in muscle and liver tissue exhibited opposite trend. Conclusively, n-3 fatty acids deposition in liver of fish were higher in NG starch fed groups compared to G starch fed group. © 2011 Kumar V, et al.