Desempenho de reprodutores de tilápia do Nilo alimentados com rações contendo nucleotídeos purificados

Abstract

The objective of this study was to evaluate the effects of the inclusion of purified nucleotides in diets for Nile tilapia (Oreochromis niloticus). The animals were distributed in a completely randomized experimental design, consisting of five treatments and four replicates. The treatments consisted of isoproteic and isoenergetic rations containing 28% of digestible protein (PD) and 2800 kcal of digestible energy (ED) / kg of feed and five levels of inclusion of purified nucleotide in the proportions of 0.00; 0.25, 0.50, 0.75, and 1.00%. After five months of feeding and reproductive management, growth, somatic indexes, seminal and sperm parameters, centesimal composition of different tissues, plasma biochemistry, hematological indices and histological parameters were evaluated. Breeders fed diets containing 0.25% nucleotides had a higher (p <0.05) percentage of spermatozoa with intact nuclear chromatin. Fish fed with rations containing 0.00; 0.25 and 1.00% presented the highest (p <0.05) viscerosomatic, gonadosomatic and hepatosomatic rates, respectively. Hepatic fat and plasma triglycerides were reduced (p <0.05) in all treatments in which breeders were fed nucleotides; HDL was higher (p <0.05) in the plasma of fish treated with nucleotide rations. The height of the villi and tunic were also influenced (p <0.05) by the supplements fed. The other parameters evaluated were not influenced by the rations (p> 0.05). It is concluded that the feeding of tilapia fed with rations containing nucleotides present improvements in the reproductive parameters and interfere positively in the metabolism and intestinal morphology of the reproductive system, feeding of these animals with rations containing 0.25% of inclusion improve the sperm and gonadal condition .