What is the frequency of cows with black-and-white coats?

There isn't a simple answer to the question "what is the frequency of cows with black-and-white coats?" because it depends on several factors:

* Breed: Some breeds are predominantly black and white (like Holstein Friesian), while others are rarely black and white (like Jersey).

* Location: The prevalence of different breeds varies across the world, so the frequency of black and white cows will be higher in areas where breeds like Holstein are common.

* Specific color patterns: "Black and white" is broad. Some cows are mostly black with white patches, while others are mostly white with black patches.

* Data Availability: It's not like we have a global census of cow coat patterns!

It's more accurate to say that black-and-white cows are a common sight, especially in areas where dairy farming is prevalent, due to the popularity of the Holstein breed.

If you'd like to learn more about the frequency of black and white cows in a specific region or for a specific breed, you could search for agricultural statistics for that location or breed.