Hoof and horn
Typical Nutrient Content
Nitrogen: 12
Phosphorus: 2
Potassium: 0
References: [1]

Hoof and horn meal is made from cooked ground dehydrated cattle hooves and horns obtained from slaughterhouses.

It is equivalent to Blood Meal in nitrogen content, but the nutrient availability is slower, which is better for organic crops and with less "leaf burn" damage and it contains phosphorus. It's nutrient availablity starts at around 4-6 weeks and can lasts 12 months.[1]