horse feed

I have just learnt that a lot of supplements are not what they should be, or proclaim to be. Also, that not all companies that sell supplements are nutritionists despite their claims. I have just discovered my 2 horses are deficient in selenium. I know this, because I have just had them blood...

How much hay should I be feeding my 14.2 Welsh sec D in winter ? He gets around 5kg in the morning and 5 at night (if he is in all day) if he has the morning in the field he will get around 8kg a day. On days that I will be slightly later down he will get 6kg at night. However the net is always...