Which of the following is NOT a primary requirement for working equines?

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The primary requirements for working equines focus on their basic health and well-being to ensure they can perform their tasks effectively. Fresh water is essential for hydration, as equines need a constant supply to maintain their overall health. Salt is important as it helps in electrolyte balance and aids in preventing dehydration, especially in active horses. Grains can be part of an equine's diet, particularly for those that require additional energy for work or performance.

Regular grooming, while important for the comfort and hygiene of the horse, does not fall under the category of primary nutritional or health needs. Grooming helps maintain a horse’s skin condition and enables the handler to check for injuries or health issues, but it is not as foundational as water, salt, or a proper diet. Therefore, grooming, while beneficial, is not a primary requirement in the same way that the other options are.