30 May NOTE: If you'd like to see our full DragonVale Breeding Guide, click here. So, every once in awhile you'll set up two dragons to start breeding and get hit with a lengthy 20 or 24 hour breeding time, and you'll want to know just what IS that dragon going to be when they're done doing the nasty? Is it worth. Breeding timing refers to the purposeful timing of insemination during the estrus ( heat) period in order to maximize fertility and the chances of conception. Learn more about Dog Breeding Timing at kampunginggris.co 10 Aug It has been known for quite a while that breeding close to the time of ovulation ( egg release from the ovary) improves the chances for farrowing and larger litter size. This occurs because the time period that eggs can be fertilized is limited to only h after ovulation. Fertilization of older eggs or fertilization.