I can say that horses absolutely can tell. A stallion will definitely have a reaction to a lady on her period.
If a horse can tell, I would think a deer could tell.
If I had to venture a guess, I would say it would be a benefit.
Urine is urine. If you pee on a scrape, bucks react like another buck peed in their scrape. I would expect that a lady on her period is like a doe in estrus.
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