"I have no evidence to support it but I doubt if Neolithic herdsmen were concerned with providing roofs for their corrals (if corrals are what some of these circles were). Shelter from strong winds and driving rain would be enough for cattle, sheep and pigs and would have provided a degree of protection from predators (presumably wolves were still a problem back in the Neolithic?)."
oops I jumped to that conclusion . I'm sure it has been mentioned before but wouldn't it be easier to just build temporary wooden coralls . Particularly in relation to transhumance . Sharing the living space is likely too.