It depends on the female. Some will go every season and some need to rest. Then there are some that you think can go again and decide to take the season off on their own.
Track your females weights!! ... They should have good weight gain from the previous year before you even think about putting them back in rotation a second year in a row.
And then sometimes, it's just good to give them a breather even if they are back up to weight.
Hope this helps.
-adam
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