My lavender was raised on F/T - which is usually what I feed her.
First time I offered her live - she looked surprised that it moved - and did a very clumsy constriction. Second time I fed her live - she had the constriction thing all figured out.
She only constricts live prey though - unless I trick her by dangling f/t in front of her (which I do when someone wants to see a snake constrict)
My suriname boa was raised on live (before I took him in) and refused f/t if I didn't dangle it in front of him. Two or three times of that - and he took 'em w/o enticement, no constriction.
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3.5 L. getula californiae
1.1 L. getula nigrita
1.0 Boa constrictor constrictor (suriname, fostering/rescue)
2.3 Elgaria multicarinata multicarinata