This Is Who Really Makes Costco's Kirkland Signature Butter - Tasting Table
Briefly

Kirkland Signature Grass-Fed Butter, produced by Westland Milk Products in New Zealand, offers a high-quality alternative to traditional butter. Unlike mass-produced options, this butter derives its superior flavor and color from cows that graze on nutrient-rich grasses year-round, contributing to higher levels of beta-carotene. Its production is also environmentally friendly, generating significantly lower carbon emissions compared to global averages. The comparison to traditional Irish butter highlights a competitive edge in taste and quality, making this grass-fed option worthwhile for those seeking premium dairy products.
Westland Milk Products' general manager of sales and marketing Hamish Yates, credits the bright yellow color of their butter to the flourishing pastures of New Zealand, saying that the color is due to the higher levels of beta-carotene in the cream, which is derived directly from the grass the cows eat.
The country's mild climate means that cows can graze in open pastures throughout the entire year. Good for not just the cows but also the planet, New Zealand's dairy industry produces almost 50% less carbon emissions compared to world averages.
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