The original question was about snakes losing venom delivery ability if fed F/T prey. The question was not about the nutritional value of F/T or a trait passed on to offspring (evolution or genetics).
The physiological concept of "use it or lose it" is called atrophy. That strapping mover can lose livelihood after an illness or injury, because of atrophy. That is why we have disability insurance.
Whether venomous snakes lose effectiveness when removed from the natural situation of envenomating prey is still the question.

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