EFFECT OF DRYING TEMPERATURE OF Passiflora edulis RESIDUES ON RUMEN DEGRADATION KINETICS AND ENTERIC CH4 AND CO2 PRODUCTION

Abstract

The aim of the present investigation was to evaluate the effect of the drying temperature on Pasiflora edulis husk residues on the degradation kinetics and enteric mitigation of CH4 and CO2. Four drying temperatures were evaluated: 60, 90, 120 and 150 °C. The digestibility of dry matter and organic matter showed differences (P <0.05) between treatments, obtaining the higher digestion at 60, 90, 120 °C, in ranges between (75 and 68%) and (77 and 70%) of the DM and OM respectively. The rumen degradation of DM was observed that both in the soluble fraction (A), insoluble but potentially degradable fraction (B) and degradation rate in percentage per hour (c), it was higher at drying temperatures of 60, 90 and 120 ° C (P <0.05). The rumen degradation kinetics of the NDF was obtained for both the soluble fraction (A), insoluble but potentially degradable fraction (B), the ruminal degradation rate (c) and effective degradation (ED) at the different passage rates (k) in P. edulis dried at 60 and 90 °C (P <0.05). While for the degradation potential (A+B) the higher degradation was observed at 90 °C of drying temperature. Gas production [GV (mL gas)] was lower (P<0.0001) in P. edulis husks dried at 60, 90 and 120 °C with a difference of 147.8 mL gas/0.500g of fermented DM compared to P. edulis dried at 150 °C. However, the production of CH4 and CO2 [GV (mL CH4); (mL CO2)] was lower (P=0.0002; P<0.0001 respectively) in the dried P. edulis residue of 60 °C (24.9 mL CH4 and 84.2 mLCO2/0.500g of fermented DM respectively). It can be concluded that drying at high temperatures (150 °C) residues of P. edulis reduce rumen digestion and increase the production of greenhouse gases in ruminants.