Yes, you too can now add more color to the dairy farm by using these bright mini-heffers. And they're not difficult to get. Players gain them once a baby calf is born. Once born, you can share the announcement by allowing friends to Adopt the Baby Cafe! via the Facebook news feed. Friends even get to choose the color.
Dairy farms with a higher prominence of one color will also increase the likely event that new calves will share the same color trait.
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[via LightChan and FarmVille Wiki]