It’s a wet year. In dry years, the cattle have it a lot rougher.
The white ones are Brahmas, which do well in the Texas heat and are resistant to certain diseases. The others are Herefords. The bull is a Brahma. Crossing that with Hereford cows yields something called a zebra stripe, which is considered desirable. I am told it is a good trade off between the benefits of the Brahmas and the meat yield of a Hereford, but I am a city boy and cannot speak from personal knowledge.
This was taken this past weekend in Lavaca County, Texas. “La vaca” means “the cow.” A “vaquero” is a person who works with cattle. An English corruption of “vaquero” is “buckaroo.”