It depends what the contract says. If it states that no supplements are given on Mondays, then it is what it is.
I don’t know why boarding barns have to be so fricken weird sometimes. Then it becomes an “us” vs “them” thing and there’s resentment.
I think it’s a bizarre to not feed supplements on a Monday, and the boarders can’t even come to do it themselves. It’s just weird the things that are cut out or the rules that are made sometimes. If the barn was otherwise perfect, then I’d possibly be like “whatever” but I’ve been fortunate enough to be at places that are open 7 days a week, feed (everything or let me do it) 7 days a week, and generally did not give people special or preferential treatment. Horses are 24/7 365. People that don’t get that, shouldn’t be in the business. It’s bloody hard, and if you’re not up for that, don’t own/manage/work at a barn. I worked at a barn when I was younger and it motivated me to finish my degrees and get a non horsey job
I honestly am cringing a bit that this is, what I assume to be, a full service boarding stable, but giving meds is considered to be “a favor”
I think the Monday thing is also a bit blurry. It seems as though you’re working but also off? As in you don’t expect to do the usual full amount of work? So that doesn’t help set clear boundaries either. You could chat with the BO and come out with a clear reminder and inform all boarders that supplements aren’t given on Mondays (unless it’s stated otherwise in the contract, then that’s another matter). IMO meds should be given regardless, as prescribed, and not as a “favor” or seen as a favor. If the barn cannot give meds, the boarder should be allowed to, IMO.
Some barns do charge extra for certain med administering, which in some cases I can understand if it’s not simply just put into the feed.