I dont understand how grass can enter an animal like a cow, have nutrients extracted by the cow and then be excremented as fertilizer? My point is that if i got the same grass, soaked in water and added it to plants without removing any nutrients it would be a useless fertilizer. How come you ca take the same grass that has been robbed of nutrition and the result is an excellent plant fertilizer? The cow cannot add nutrients of its own or it would e entually starve of the nutrient. Please explain.