Meat can be kept in the freezer for a year if sealed properly. And even then the nutrients are not really compromised. It's more likely to be freezer burnt which may make it less palatable. 6 months should be no issue at all.
The only thing I would caution you about is that cats tend to change their mind on a whim. So you could make up 6 months of food and a month from now your cat decides that what you're feeding is poison and refuses to go near it.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...