Conversion Ratio of Raw Blood to Blood Meal

Average conversion of raw blood to blood meal is:

Correct Answer: 5 : 1

The average conversion ratio of raw blood to blood meal is 5 : 1 — meaning 5 kg of fresh blood yields approximately 1 kg of blood meal after drying.

Why is the Blood Conversion Higher than Bone?

• Fresh blood contains approximately 80% water (blood is mostly water + haemoglobin + plasma proteins).
• Drying/spray-drying removes nearly all of this water → 5 kg blood → ~1 kg dried blood meal.
• Bone (3:1) has less water and more mineral/protein mass → less mass loss during processing.

Blood Meal Properties

• Protein content: ~80% (one of the highest among all animal feed proteins)
• Rich source of Lysine (an essential amino acid often deficient in plant-based diets)
• Deficient in: Isoleucine and Tryptophan (limiting amino acids in blood meal)

By-product Conversion Summary

• Raw bone → Bone meal: 3 : 1
• Raw blood → Blood meal: 5 : 1