SOCA, Mildrey; SIMON, L    ROQUE, E. Trees and gastrointestinal nematodes in young cattle: a new research approach. []. , 30, 5, pp. 1-1. ISSN 0864-0394.

With the objective of evaluating the behavior of the gastrointestinal nematodes of young cattle in different silvopastoral systems, several studies were developed in two stages which brought about these results: an experimental stage at the Experimental Station of Pastures and Forages "Indio Hatuey", and a stage of validation of the results in the Livestock Production Firms "El Cangre" and "Valle del Perú", in Havana province. The genera of nematodes found, in order of importance, were: Haemonchus, Oesophagostomum, Trichostrongylus, Cooperia and Ostertagia, with values of 60, 15, 13, 10 and 2%, respectively. The fecal count of eggs (FCE) showed significant differences (P<0,01) from the second month of evaluation in favor of the silvopastoral. Estos resultados forman parte de la tesis presentada por la primera autora en opción al grado científico de Doctor en Ciencias Veterinarias, titulada "Los nemátodos gastrointestinales de los bovinos jóvenes. Comportamiento en los sistemas silvopastoriles cubanos". system (SS), with values below 600 epg, as compared to the system without trees in which it was maintained over 1 000 epg. No effects of the weight or the sex of the animals on this behavior were found. However, significant correlations were observed (R² = 0, 859*) between the live weight increase and the decrease of the FCE. The stability and better behavior of these parasites in the SS were related to the effects of the decomposition process on the decrease of the parasite rate of the excreta and the relationship that is established between the dry matter availability, the pasture height and the chemical composition of the herbaceous and tree strata. The results showed the potential of these systems for contributing, significantly, to the decrease of nematode infestations in young cattle under Cuban conditions.

: Nemátoda; terneros; sistemas silvopascícolas; Calves; nematodes; silvopastoral systems.