We have field that hae zero shade in them so we geneally will provide them access to a runway that is llined with trees. I don't know how much it matter really but I sure don't want the state welfare guys coming out and saying something about it.. If I lock them out of the alley ways they search for what little shade a pasture might have and follow it.. Kind of a pain in the arse.  Generally only an issue if it gets above 85-90 with the red cattle btut the blacks will be in about 5 degrees earlier depedning on breeze, time of year and humidity.. Middle of march and 70 and they would probably all be heading for shade. July and 90 with low humidty and a good breeze and a lot might forget about the shade..

We are actually working on a plan that will increase the sahde in some of the pastures... It is not for shade however that the plan is for but for windbreaks.. The added benifity is they will provide some shade as well.