This video was taken yesterday. I’ve never seen the dapples on my horse before. The previous owner said she had seen some on his rump but never on the sides. I sent these photos to a Freesian Facebook page and one of the breeders who is a certified nutritionist, said this is a cry out for nutritional deficiency. The dapples and the rusting show a problem, she says. She wanted me to withhold all supplements and put out a copper Salt Lick, which i wont do.
. But is there any possibility this is a nutritional deficiency? It’s been years since I’ve balanced his hay. With a barn that gets different day every few months and different suppliers of Timothy Pellets etc. I just kept things the same. Any thoughts on if this is a problem and what I could do to fix it? Thank you

https://youtu.be/otZJSVjolR0