Eating...first mouse since september

[PO_0784]

my bp took his first mouse last week (last time was in mid september). He is 3 feet and a couple of inchs and he do need to eat a lot more than a single mouse! Now, he isn`t interested in food again (GRR). He never took a rat before because he wasnt interested but I will try tomorow. Any trick to get him on rats??? It would make my life a lot easier than a " 5 mice a week" schedule. Need help plz! He is getting SOO skinny. He did an almost perfect shed last week.. everything seems ok except that he isn`t eating at all