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The genus Urochloa includes most of the important grasses and hybrids currently used as pastures in the tropical regions. Cytogenetic analyzes have identified some aneuploid hybrids that provide new perspectives for genetic breeding. The objective was to analyze the meiotic behavior in euploid (2n = 4x = 36) and aneuploid (2n = 4x = 36 + 2) hybrids of U. ruziziensis x U. decumbens and U. ruziziensis...