Don't know if this is relevant, but in N. Yorks., a white cow is thought to bring good fortune. There is a legend, The White Cow of Wardle Rigg :
One day, a frail old woman stopped at the remote farm on Wardle Rigg, overlooking Wheeldale, and asked for a drink of water. The farmer's wife took pity on her, gave her a meal, and invited her to stay the night. That night the old girl died, leaving all her worldly possessions to the farmer and his wife. This wasn't so good. Her only possession was a bag of bones skinnier than the old girl herself - an ancient and knackered white cow. It would cost more to feed it than it could ever benefit them. Still, they kept it, more out of sympathy than anything else,and treated the poor thing as kindly as they could afford. But after a short while, the cow began to fill out ... and out ... and OUT! Within a year, it was the most magnificent beast anyone for miles around had ever seen. They sold it at market, and made a small fortune!
Relevancy to your area is admittedly doubtful - but if you didn't like the story you're surely ice. Ha!