Table 2.13.1 shows the amount of standard excretion for major livestock types. The amount of feces and urine excreted from each type of livestock is calculated under the conditions of standard feed conditions according to animal type and body weight. Generally, cow manure has a high carbon content (C/N ratio: ratio of carbon and nitrogen contents), but there are many organic materials that are relatively difficult to degrade, and poultry manure includes high concentrations of nutrient chemicals, such as nitrogen, phosphorus and potassium, and also contains many types of organic matters that are relatively easy to decompose. The category “waste” in slaughterhouse residue includes substances that are not suitable as foods (inedible visceral, bone, fat, blood, skin, and feathers.