Headlocks are Self-locking stanchions along a feed Alley in which cows voluntarily enter the head slot when going to eat. All cows may be held until Herd health work is completed, and then all cows may be simultaneously released. Headlocks may be adjusted to remain open, allowing cows to come an go at will, when restraining the cows is not necessary.

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Other /More definition:
Headlocks are Self-locking stanchions along a feed alley in which cows voluntarily enter the head slot when going to eat. All cows may be held until herd health work is completed, and then all cows may be simultaneously released. Headlocks may be adjusted to remain open, allowing cows to come an go at will, when restraining the cows is not necessary.