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COSTA, M. B. Metabolomic characterization of plasma of Nelore bulls with divergents EPDs for growth. 2018. 60 f. Defesa de dissertação – Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, 2018. The identification and animals selection with greater genetic potential of growth has provided a substantial increase in the productive indexes. For many tools of genetic breeding, changes in animal growth patterns have been used, they can modify animal metabolism and consequently, metabolites. Therefore, the objective of the present work was to analyze the effect of the genetic potential for post-weaned growth on the performance and metabolome of Nellore male bull plasma during the finishing period. Plasma samples were collected from 74 Nelore bulls with different growth potential and from two different herds. Both herds were divided into animals of high and low genetic potential for growth. The animals were kept in feedlot, receiving the same diet throughout the experimental period. The animals were periodically weighed to evaluate the mean daily gain and the day before slaughter, blood collection was performed for metabolic analysis of the plasma. The metabolomic profile of the plasma samples was determined using Nuclear Magnetic Resonance. During the selection of animals from herd 1 during the growing phase, the weight gain of the high growth herd 1 animals was 323 g / day higher (P <0.0001) and the live weight to the overane was 54 kg higher (P = 0.05) compared to low growth animals, evidencing physiological and phenotypic differences between the groups at that time. It was also observed in the herd 1 greater live weight at the end of the period of 35 kg (P = 0.004) for the high growth animals. In addition, the results obtained in this study did not show statistical differences between the different genetic potentials for growth at the end of the study. Therefore, the present study concludes that the phenotypic difference as a function of the genetic potential for growth occurred during the selection period, althoug this difference was not observed during the finishing of the animals, in the same way, there was no metabolomic difference in the animals plasma according to the genetic potential for growth, evaluated in the final termination period.

Caracterização metabolômica do plasma de tourinhos Nelore com divergentes DEPs de crescimento