Resumen

GARCIA-FERRER, Lidia et al. Concentration of phenolic compounds in tropical forage fabaceae at different regrowth time. Agrociencia [online]. 2016, vol.50, n.4, pp.429-440. ISSN 2521-9766.

Fabaceae are an option to increase the availability of protein in the prairies, but species of the Fabaceae family contain phenolic compounds, which depending on their number and type, benefit or harm livestock production. The aim of the study was to determine the concentration of phenolic regrowvth compounds of different ages of Arachis pintoi, Stylosanthes guianensis, Clitoria ternatea and Pueraria phaseoloides. The study was carried out in an experimental field, INIFAP-Tabasco, Mexico, from March to August 2013, covering the dry and rainy seasons, and in four ages of regrowth after uniformity cutting: 21, 42, 63 and 84 d. The variables evaluated were the concentrations of five types of phenolic compounds: total polyphenols (PFT), no tannins (FNT), condensed tannins (TC) hydrolysable (TH) and total tannins (TT). Sixteen treatments were evaluated in a design of completely randomly divided plots with three replications, the species as main plot, and regrowth age as a minor plot. Comparisons between means were performed using the Tukey test (p≤0.05). We observed the interaction species x age of regrowvth in the five types of compounds. The highest concentrations of phenolic compounds (CF) were obtained in all species at 42 d of regrowth. Clitoria ternatea presents the highest concentrations in the months without rain (155.4, 40.1, 16.9, 98.4 and 115.3 g kg-1 MS of PFT, FNT, TC and TH) and rainy (121.7, 39.6, 20.1, 61.9 and 82.0 g kg-1 MS of PFT, FNT, TC and TH). In contrast, S. guianensis presented lower concentrations of CF. The TC concentration varied between species, in the months without rain from 4.62 (Stylo) to 20.21 (Kudzú) g kg-1 MS and in rainy months from 3.66 (Stylo) to 20.10 (Clitoria) g kg-1 MS. No species reached the toxic level of 60 g kg-1 MS of TC. Results showed that the concentration of CT varied among species and age of regrowth. Among species, the highest concentrations were observed in C. ternatea and the lowest in S. guianensis. The interaction species-regrowvth age determined the concentration of phenolic compounds.

Palabras llave : Arachis pintoi; Stylosanthes guianensis; Pueraria phaseoloides; Clitoria ternatea; fabaceae; condensed tannins.

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