Efeito da adição de nucleotídeos em dietas de parentais e prole de tilápia do Nilo sobre a saúde, crescimento e resistência da progênie

Abstract

The effect of the addition of nucleotides in the diet of parental and offspring on the health, growth and resistance of the offspring was evaluated. The parents were fed diets containing 28% digestible protein (PD) and 2800 kcal digestible energy (ED) per kg-1 of feed, with three levels of inclusion of nucleotides (0 g, 2.5 g and 5 g). The offspring were fed for 100 days, post-larvae fed diets containing 38.6% PD and 3800 kcal ED kg-1 (40 days) and juveniles with diets containing 32% PD and 3200 kcal ED kg-1 (60 days) all with four nucleotide inclusion levels (0 g, 2.5 g, 5 g and 7.5 g). The parameters of zootechnical performance in post-larvae and juveniles, hematological parameters, plasma lysozyme activity, biochemical parameters in the liver, catalase (CAT), superoxide dismutase (SOD), lipoperoxidation (LPO), alanine aminotransferase (TGP) and aspartate aminotransferase (TGO) in juveniles. Survival was analyzed after transport challenge in juveniles. In the challenge with the bacterium Aeromonas hydroplila the survival was evaluated after 15 days and the biochemical parameters already mentioned were evaluated in the fifth day of challenge. The hematological parameters were not altered by the inclusion of nucleotides in the diets (P> 0.05). Feeding of the parents with2.5 and 5 g kg-1 nucleotides provided better offspring survival (P <0.05) in the challenge of transport. The inclusion of 2.5 g of kg-1 nucleotides in the parental and offspring diet provided an interactive effect provided greater final weight (P <0.01), biomass gain and feed intake of post-larvae and juveniles (P <0.05). Inclusion of 2.5 and 5 g of kg-1 nucleotides in the parental caused lower LPO levels (P <0.05) In the challenge against bacteria provided greater survival was found in the treatment where parental and offspring received 2.5 g AS kg-1 in the diet. The addition of nucleotides in the parental and offspring diet had a beneficial effect on progeny development, resistance and growth, and the use of 2.5 g AS kg-1 in the diet of parental and offspring was recommended.