i started my lurchers of at 5 to 7 month old on droppers then git them out on the lamp from then on for some proper rabbit's and at about 12 month give them some big rabbit's on the lamp and that has alway's work'ed for me and ive got one bitch that's 8 years old now and she is still going and my other bitch is out of her and she is just over 2 years old now and ive just got a pure sulki it's 14 month's old and he's not as easy to git runing but that mite be the bred