I never said anyone shouldn't cull a cow that is doing poorly, no matter what color it is. I simply said there is nothing wrong with a cow , of any color, resting in the shade or in water during the heat of the day. I haven't gone back through these 6 pages, but I do not recall anyone saying that their black cattle doing this in the heat of the day, were losing weight while other -color cows were gaining weight.
I went down to my friend Scott's place last week, to take 2 pointer puppies i had acquired. We rode out to the Kudzu pasture that we used to keep the Corrinte cows on. All we have left on this property this year, are the 4 Corriente heifers we kept from last year, the 4 plummer cows I traded for this spring ( all 8 of these are colored with the various colors and pattterns that Criolo cattle have), a Brahma x Chi-Angus (solid black) and a Brahma x Chianina ( solid white) that I got in May, and a black Corriente bull. All 11 were laying in the creek where the trees over hang. 98 degrees that day at noon, probably got hotter by 4, with nearly 100% humidity. They have probably done this every day since May, and will do so til October. None of them, even the black or mostly blacks, are "doing poorly".