This is my first season of producing my own snakes. I choose to hold back my multi gene females because I need to replace some of my single gene females with more genetic power. Basically, I have 3 projects that are my focus, and the other stuff is "fun" or "cool looking" to me. I know that I could have made some money by selling more, but I want to increase my future options, so this year is a heavy hold back year. I think it basically comes down to asking yourself "What are my goals?" and "Which animals will best help me achieve these goals?" Make your hold back and/or trade decisions based on that. Next you can decide if you want to hold anything more back based on remaining rack space/time that you have. If you hold back a quality animal that you are unsure about, but feed it on a regular basis so that it is growing at a healthy pace, you will have options with that animal in the future, whether that is to use it yourself, or to trade or sell it. You really need to know what your goals are to make good hold back decisions.