You realy cant stimulate breeding. The female has to be receptive before they will breed. I think the males pretty much are ready to go anytime you want, but the females need to be ready. If you are in nice weather, I found that my female jackson was much more receptive more often when exposed to sunlight than when indoors.
All of my matings have happened when I housed my chams outside in my outside enclosure. Maybe it's coincidence or not, but I think thats the natural way.
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Raf
1.2 Jacksons Adults (Frank, Patty, Lucille)
0.0.1 Jackson's baby (George, R.I.P. 11/17/2003)
1.1 Nosy Be's (Mars and Roja)
1.1 Veiled - No Names Yet
0.1 Adult Sulcatta (POOPIE,I bought it from Victor at Kobey's in SD)
0.0.2 Baby Sulcattas (frick and frack)
1.0 Home's Hingeback Tortoise (SPEEDY, From Victor as well)
1.2 Red ear slider babies (Hingis, Dingis and Dorkus)
0.0.1 3 toed box turtle - No Name Yet
0.0.1 Gulf Coast Box Turtle - No Name Yet
1.0 Red Siberian Husky (Harley)
0.1 Black Lab (Krissy)
0.1 English Bulldog (Alice)
0.1 Blue Merle Great Dane (Wednesday)
Saltwater Fish and Inverts too