I know that was me being a wise guy, sorry. But really, shortly after I started free ranging my chickens, I don't need to fertilize my yard anymore. However if you due need fertilize, any natural fertilizer (animal waste) should be fine. Just don't use the pelletized synthetic stuff you by at the big box stores. It's the perfect size for chickens to confuse as scratch or food. Two of the best animal fertilizer I am aware of, are rabbit, or goat droppings. These both are what are called cold fertilizer, so they do not need to be compost before using. Other hot manures cow, horse, etc have to be composted or they will burn your plants and lawn.