I feed the horses that! I pay £26 for a 20kg sack, but it's cheaper if you buy direct from the mill (they don't deliver to my postcode). £5.77 for 3kg direct
https://www.charnwoodmilling.co.uk/mail-order/Horse_Food.html
The ladies are disgusted with me for making them all have their fluke and worm dose. The Ewerhythmics are settling in at boot camp (it's the croft Loppy was born on and lived on for the first 6 years of her life, so she'll show the other two round!) and the rest followed me happily down to the point after I'd freed April who'd somehow managed to get her head stuck between a gate and a gatepost going after a tasty bit of gorse bush.
Ladies following me down the track, blue dot is single lamb, blue stripe twins, red dot no lamb.