Dietary Encapsulated Butyric Acid (Butipearl?) and Microemulsified Carotenoids (Quantum GLO? Y) on the Growth, Immune Parameters and their Synergistic Effect on Pigmentation of Hybrid Catfish (Clarias macrocephalus × Clarias gariepinus)

摘要

A 12-weeks feeding trial was conducted to evaluate the effects of encapsulated butyric acid (ButiPEARL?) andmicroemulsified yellow carotenoid (Quantum GLO? Y) on growth, immune parameters and their synergistic effecton pigmentation of hybrid catfish. In the experiment, the catfish was randomly divided into 12 groups of 15 fishesand then fed with four experimental diets containing 0.5 kg/t ButiPEARL?, 0.7 kg/t Quantum GLO? Y, 0.5 kg/tButiPEARL? + 0.7 kg/t Quantum GLO? Y, or none of these supplements (control diet). The results showed that theButiPEARL? + Quantum GLO? Y fed group gave the highest yellowness (b*) score of 18.43 in the back muscleand almost double the total carotenoid measured in the fish muscle (151.35 mg/kg) compared to the Quantum? Yfed group. This suggests that butyric acid in the diet had a synergistic effect on carotenoid absorption andpigmentation performance of catfish. The body weight of all treatment groups was significantly different from thecontrol group and the catfish fed ButiPEARL? alone had the highest body weight gained followed by theButiPEARL? + Quantum GLO? Y fed group with an FCR improvement of 25 points and 13 points respectively overthe control. There was no adverse effect on the immune system after feeding both butyric acid and carotenoid to thecatfish and the immune parameters (number of leucocytes, erythrocyte, percent of hematocrit, haemoglobin andtotal protein) of ButiPEARL? + Quantum GLO? Y fed group were improved compared with the other groups. Inconclusion, ButiPEARL?, Quantum GLO? Y and the combination have positive effects on performance andpigmentation in catfish aquaculture.