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The present research aims to measure the ciliated protozoa concentration, pH, the concentration of volatile fatty acids (VFA) and the in-vitro dry matter degradation in a culture environment based Parmentiera aculeata Kunth. The treatments were: T1, 300 µL of Avena sativa; T2, T3 and T4 had 150, 300 y 450 µL of P. aculeata Kunth, respectively; and T5, 300 µL of Chenopodium ambrosioides L. Every treatment was inoculated with ruminal fluid and incubated for 3, 6, 12, 24, 48 and 72 hours to 38±0.5 °C. Based on a randomly experimental design, the data was analyzed by GLM and the means were compared with Tukey (p≤0.05) while the protozoa concentration was analyzed with a rank test. There were differences in the protozoa concentration and pH between treatments; T3 and T4 had the largest amounts (p≤0.05) compared with the other treatments, especially with T5. There was no difference (p≤0.05) in the acetic acid concentration between T1, T2 and T3 compared with T4 at 72 hours and with T5 from 6 hours of incubation, besides for the concentration of butyric acid T5 had the lowest amount (p≤0.05) at 72 hours. The smallest concentration of total VFA was for T4 and T5 from 48 hours. P. aculeata Kunth used like subtract helps to preserve for 3 days a ciliated protozoa population of 104 without alterate the fermentation process. Keywords: Agroforestry, Livestock, Animal nutrition, Wildlife rumen. Â