“…No reference range exists for 3-epi-25(OH)D3 in humans, therefore data from a systemic review which reported ranges from several studies was used (see Bailey et al (2013) [ 79 ]). The number of studies included to provide data for each of the veterinary species are as follows: ( A ) dogs n = 8 [ 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 ], cats n = 1 [ 85 ], horses n = 1 [ 88 ], sheep n = 4 [ 30 , 89 , 90 , 91 ], cattle n = 2 [ 92 , 93 ], pigs n = 1 [ 94 ], poultry n = 2 [ 95 , 96 ] and nonhuman primates n = 2 [ 97 , 98 ]; ( B ) dogs n = 2 [ 81 , 85 ] and cats n = 1 [ 85 ]; and C . dogs n = 1 [ 83 ].…”