Resumo

TORRES SALADO, Nicolás et al. Productive behavior and quality of hybrid pastures of Urochloa and star grass grazing with cattle. Rev. Mex. Cienc. Agríc [online]. 2020, vol.11, n.spe24, pp.35-46.  Epub 07-Maio-2021. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v0i24.2356.

In tropical areas grasses are the main source of food for ruminants, however, environmental conditions and the management of grasslands directly affect their performance and quality. The objective was to study the effect of the performance of the hybrid pastures of Urochloa and star grass (Cynodon plectostachyus) at different frequencies and grazing intensities, with cattle in the dry tropics. Cobra, Mulato II and Cayman (Urochloa) and star grass grasses were evaluated at cut frequencies of 28 and 35 d, and severe and light intensities of 10 and 15 cm, respectively, which were randomly distributed in a block design randomly with 2 x 2 factorial arrangement with three repetitions. Management effect was observed in the accumulation of DM, the accumulation being higher at a lower frequency and light grazing intensity regardless of the grass evaluated. Cobra, Cayman and Mulato II grass obtained the highest frequency yield at 35 light intensity with an average of 6 679 kg DM ha-1 while, in that handling the star grass obtained the lowest yield with 4 028 kg DM ha-1. The highest crude protein in leaf, in all pastures was found in severe grazing and intensity at 28 d with 20, 20, 18 and 10% in Cobra, Mulato II, Cayman and star grass, respectively (p< 0.05). It is concluded that the highest forage production was obtained by harvesting at a light intensity of 15 cm, every 35 d and the highest protein content was reached when the forage was harvested at an intensity of 10 cm and a frequency of 28 d.

Palavras-chave : frequencies and intensities grazing; quality; tropical grasses.

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