Seedstock producers are cow/calf producers who produce for purebred or commercial operations.

Breeding stock.

Explanation:

Seedstock producers are cow/calf producers who produce breeding stock for purebred or commercial operations.

This ultimately implies that, seedstock producers are individuals who are saddled with the responsibility producing cow/calf by making the breeding stock available for other livestock farmers. Thus, the breeding stock are the primary calves that are used for producing cattles in large quantities.

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