Dad-Mom-clutch number for that year-2-digit year code.....like HG44B09. More details in my first post in this thread. My clutch tab just shows that code, the genetics of the male, genetics of the female, date of first breeding (and later breedings), date of pre-laying and post laying sheds (at least the pre-laying), date of rebreedings (and the male used), etc. I also list a set of numbers in the file and on each box of eggs: 14-2-3 would mean 14 good eggs, 2 bad eggs, and 3 iffy looking eggs (that almost always turn out to be bad eggs). In hindsight, I should have done good-maybe-bad eggs in that order since it is more logical.......but I started with the good-bad-maybe order since that's how I had seen it done elsewhere before. It'd be confusing for me to change no since all of my old records would be a different order than the new ones.