Field ornament aged 25, Tb, can’t be ridden due to two previous collateral lig injuries and a superficial suspensory. No muscle whatsoever, ie scrawny neck, hollows behind withers, but weight generally ok. Has ad lib hay, haylage gives her squirts. What would you feed for condition and build up muscle? I’m currently feeding grass pellets soaked and a mug of linseed twice a day. Horse is on long term loan and owner doesn’t want her back. She’s a sweet mare, no trouble at all.