From: Preliminary investigation of potential links between pigmentation variants and opioid analgesic effectiveness in horses during cerebrospinal fluid centesis
Coat colour phenotype
Mean analgesic effectiveness
Median analgesic effectiveness
Mean dosage rate (mg/kg BW)
Median dosage rate (mg/kg BW)
Bay (n = 29)
2.7
3
0.014
0.015
Chestnut (n = 18)
2.1
2
0.02