Arquivo Brasileiro de Medicina Veterinária e Zootecnia (Aug 2008)

Efeitos da adição de propilenoglicol ou monensina à silagem de milho sobre a cinética de degradação dos carboidratos e produção cumulativa de gases in vitro Effects of adding propylene glycol or monensin to corn silage on the degradation kinetics of carbohydrates and in vitro cumulative gas production

  • B.N. Faria,
  • R.B. Reis,
  • R.M. Maurício,
  • A.M.Q. Lana,
  • S.R.V. Soares,
  • H.M. Saturnino,
  • S.G. Coelho

DOI
https://doi.org/10.1590/S0102-09352008000400019
Journal volume & issue
Vol. 60, no. 4
pp. 896 – 903

Abstract

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Avaliaram-se os efeitos dos aditivos propilenoglicol e/ou monensina sobre a degradabilidade média e efetiva dos carboidratos totais, pH e produção cumulativa de gases da silagem de milho por meio da técnica in vitro semi-automática de produção de gases. Os tratamentos constituíram-se de silagem de milho (SM); SM associada ao propilenoglicol (SM+PG); SM associada à monensina (SM+MO); SM associada ao propilenoglicol e à monensina (SM+PG+MO) avaliados com duas, quatro, seis, 12, 24, 48 e 96 horas. A adição de monensina ou monensina associada ao propilenoglicol aumentou (PThe effects of the additives propylene glycol and/or monensin on the degradation of total carbohydrates, pH, and cumulative gas production of corn silage by the semi-automated in vitro gas production technique were evaluated. The treatments were corn silage (CS); CS plus propylene glycol (CS+PG); CS plus monensin (CS+MO), and CS plus propylene glycol and monensin (CS+PG+MO), which were evaluated at two, four, six, 12, 24, 48, and 96 hours. The addition of monensin or monensin plus propylene glycol increased (P<0.05) the degradation of total carbohydrates at 2h. The effective degradations of total carbohydrates for CS+MO treatment (55.2; 42.7; and 36.5%) were the highest in all passage rates. The use of monensin reduced cumulative gas production from 12 to 96h. CS+MO treatment had the lowest potential of gas production (221ml/g total carbohydrates), and the lowest Lag phase (1.08h), as compared to CS and CS+PG treatment (1.58 and 1.49h, respectively). Cumulative gas production and degradation of total carbohydrates were highly correlated (94 to 97%; P<0.01). The pH was inversely correlated to degradability of total carbohydrates (r= -0.79; P<0.01). Thus, monensin may be used for improving the ruminal degradability of corn silage.

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