Pasture height at the beginning of deferment as a determinant of signal grass structure and potential selectivity by cattle - doi: 10.4025/actascianimsci.v35i4.20421
DOI:
https://doi.org/10.4025/actascianimsci.v35i4.20421Palavras-chave:
Brachiaria decumbens, Stem, Leaf, Senescent forage, GrazingResumo
Current experiment identified the height of signal grass {Urochloa decumbens (Stapf) R. D. Webstercv. Basilisk [syn. Brachiaria decumbens Stapf cv. Basilisk]} at the beginning of deferment that provided an
appropriate pasture structure and potential selectivity by cattle on deferred pastures. Four pasture heights at the
beginning of deferment (10, 20, 30 and 40 cm) and two forage samples (available on pasture and simulated
grazing) were studied. The experimental design was set in completely randomized blocks, with two replications,
in a split-plot arrangement. Higher percentage of live leaf blades and lower percentage of live stems and senescent
forage were recorded in the forage sample from simulated grazing. The increase in pasture height increased the
percentage of senescent forage and reduced the percentage of live leaf blades in forage samples. Pasture height at
the beginning of deferment did not affect the potential selectivity index by cattle for the percentage of live leaf
blade. The potential selectivity index varied quadratically for the percentage of live stems and increased linearly
for the percentage of senescent forage with pasture height. A 10-to-20 cm reduction in pasture height at the
beginning of deferment improved the structure of deferred signal grass and optimized selectivity by cattle
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