I agree that to be safe, large constrictors must be conditioned to know the difference between feeding time and maintenance/handling/exercise time. All of my retics (with the exception of my Sulawesi who is still fairly young) are exceptionally aggressive when it comes to food. Most get very agitated and active (i.e. hunting mode) within a few days of feeding time. I have even had large retics hit the lexan or glass doors of their cage in a feeding response to movement when hungry. I have had retic's, rocks, and anacondas come across a cage in a second to the "sound" of their door's being opened. If I just casually stuck my hand in there with them I am sure I would have come away with either some very serious bites or possibly worse. To condition them I use a 56 in long wooden dowel to tap/touch their nose very lightly until they turn their heads away, prior to handling or doing enclosure maintenance. They learn this very quickly and even when hungry will back off and relax, dropping out of hunting mode when touched lightly with the dowel. I still, however, never take my eye off of them.
While I do agree that they do learn to recognize the feeding bucket I bring the rabbits and chickens in with, I have also seen ambush feeding behavior wherein a coiled non-responsive retic will hit the glass once your back is turned. This has happened numerous times when no food was present, no food smell was present, and no feeding utensils or buckets were around. I think that to assume a large predator such as a retic recognizes you as a non food item just because you did not bring in a bucket or feeding tongs is a mistake. Retic's take down some very large animals in the wild and I've seen this ambush behavior towards myself from retics who were less then 30 lbs even though my full body (215 lbs) was visible. Always err on the side of caution, even very docile retic's are still predators at heart and even if you are caught off guard just once, you may wind up in a life or death situation.
I also think that tactile or vibration stimulus is the best training tool when it comes to snakes, due to their keen senses in this area. Smells, rough handling, and the like may indeed work, but if a large retic is going to take a swing at me I'd rather be out of strike range and the dowel allows for me to keep a safe distance, have a possible blocker if needed, and allows for safe, gentle training which has worked without exception for me. Also, of late I have been designing my large constrictor enclosures with a shift so that I can safely lock the snake on one side of it's enclosure while I do any cleaning, maintenance, or waterdish filling on the other side. This, in conjunction to the nose taping seems, to me at least, to be the best method for training and working with large constrictors. Oh, and I also agree that you will want to switch your young retic onto rabbits as soon as possible. If it won't switch for you simply skip 2 to 4 weeks of feeding and then leave the small rabbit in with the young retic overnight. This will usually work as the snake should be very hungry at this point and that is usually the best stimulus to get a stubborn young retic to eat. For whatever reason this does not seem to work as well with adults (possibly because they can and will fast for long periods of time and as keepers we tend to cave in).
Best Regards
Shane Provstgaard
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1.1 Mainland retic's
1.0 Yellow head retic
0.1 Super tiger retic
1.1 Super dwarf X Jampea retic's
0.1 Sulawesi Island retic
1.1 Striped African Rock python's
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0.1 Green anaconda
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0.1 Amazon tree boa
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0.0.1 Arizona tiger salamander