Remuda
WordNet
noun
(1) The herd of horses from which those to be used the next day are chosen
WiktionaryText
Noun
- A herd of horses from which the horses to be used for a particular purpose are selected.
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- "To one side of the barn was a remuda of work-horses, perhaps twenty in all." — Wolves of the Calla by Stephen King
- "Buddy did not know what his mother was going to do, but he was sure that whatever she did would be right; so he hoisted his saddle on the handiest fresh horse, and loped off to drive in the remuda, feeling certain that his father would move swiftly to save his cattle that ranged back in the foothills, and that the saddle horses would be wanted at a moment's notice." — Cow-Country by B. M. Bower
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Etymology
From remudar "to exchange", from re- + mudar "change", from Latin mūtāre "to change".