Feeding issues with recent proven breeder purchase

Keep in mind alot of proven breeder males are sold for 2 reasons. #1 the male is no longer needed because he has been replaced. #2 the male has just got done breeding for the breeder selling the animal therefore it may still be off feed for a bit. I breed 3 different groups every year. One group will cool in october and start breeding in november, the second group will cool in january and breed in february. The third group cools in june and breeds in july. If that breeder is breeding year round the male may still be in breed mode. I would ask him. Also if hes off feed i would work with him to get on rats and leave the mice alone. If all else fails then go to the candy pantry and feed him asf.

Make sure you husbandry is optimal (appropriate size enclosure, proper temps etc), depending on his size you may consider housing him in something smaller (15 quarts tubs for males under 1000 grams often help).

No handling, make sure you feed him the same type prey than previously offered, feed in the enclosure.

Given you should have him quarantine 60 to 90 days it's plenty of time for you to figure it out.

And remember mature male are likely to go off feed during the season, you just need to see if you can help him resume feeding before you start pairing him.