I've seen this in action with some of the small mammals I've studied up close. The way their bodies react to light cycles is pretty wild. When the days get shorter, it's not just about the melatonin...
Wait, what do you mean by "the whole system shutting down"? Because if the testes are just shrinking, that's one thing—but saying the "function is gone too" sounds like a big leap. Have you actually measured fertility or hormone levels, or is that an assumption?
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