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The general rule is that mating should occur every other day. This allows for the sperm to be replenished. Daily mating will decrease the sperm count in most dogs.
You're welcome. Hopefully all females won't be "in heat" at the same time! You are probably familiar with the progesterone test to determine when a female is actually in estrus, but in general estrus occurs from day 9 to day 14 of a bitch's cycle.