Resumo

GALINDO-BLANCO, Juana L. et al. Silvopastoral system with Tithonia diversifolia (Hemsl.) A. Gray: effect on the rumen microbial population of cows. Pastos y Forrajes [online]. 2018, vol.41, n.4, pp. 273-280. ISSN 2078-8452.

A trial was conducted in order to evaluate the effect of a silvopastoral system with Tithonia diversifolia (Hemsl.)A. Gray, associated with a mixture of tropical grasses, on the rumen microbial population of dairy cows under production conditions. One hundred Holstein cows were used, which grazed in a leader-follower system, with permanence time of two days. The grazing in T. diversifolia occurred at night, and the animals remained from 5:00 p.m. until 5:00 a.m. For the rumen liquid collection six cows were randomly selected in each of the sampling times. The populations of total viable, amylolytic and cellulolytic bacteria were more numerous when the cows grazed on the SPS with T. diversifolia, with regards to grass grazing. The methanogen values were 9,83 and 19,33 10¹⁰ CFU mL^-1, and the protozoa values, of 4,67 and 7,67 10⁵ cells mL^-1 for SPS with T. diversifolia and grasses, respectively. The pH and NH₃ were higher in the SPS. The microbial biomass showed values of 196,9 and 192,3 g, and the organic matter that was fermented, of 547,2 and 506,4 g for SPS and grasses, respectively. It is concluded that the silvopastoral system with T. diversifolia improved the rumen ecosystem, by increasing the organisms that degrade fiber and reducing protozoa and methanogens; as well as making a higher quantity of fermented organic matter for the synthesis of microbial protein available for the animal.

Palavras-chave : grazing; methanogenic bacterium; protozoa; rumen.

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