Elf On A Shelf
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The tb's I've had seem to need a bit more than that and that includes when I've used bagged haylage which is consistent quality.
I notice Elf said the racehorses get up to 24kg a day and they'd weigh about 500/550kg?
Yup average horse weighs around 500-510kg. Bigger ones up to 570kg and smaller ones down to 470kg. But these guys are also in way way more work than your average horde so need more fuel. Some eat it all, some don't. Same with their hard feed. They get 4-6 scoops of nuts a day depending on size/weight etc as well as the best part of 2 scoops of alfa a a day all divided up into 4 feeds. The one thing they do all eat the second they get it are their carrots they are demons for carrots!