Give % of animals under each picture; these percentages should add up to 100%
Further background information is available in:
Risk factors for Psoroptes ovis mange on Belgian Blue farms in Northern Belgium.
Sarre C, De Bleecker K, Deprez P, Levecke B, Charlier J, Vercruysse J, Claerebout E (2012)
Veterinary Parasitology 190, 216-221
The relationship between parasite counts, lesions, antibody titres and daily weight gains in Psoroptes ovis infested cattle.
Lonneux JF, Nguyen TQ, Detry J, Farnir F, Losson BJ (1998)
Veterinary Parasitology 76, 137-148