Their products typically have higher guaranteed levels of amino acids (lysine, methionine, threonine) than competitors. Their quality control is the best I’ve seen. Tribute feeds are made in one new, clean and ionophore free facility in Ohio. Some people may love and swear by Purina Senior while others hate it…they are both feeding purina senior but what is in the bag is not the same. They use low-cost formulations so for example, they may use things like citrus pulp as forage products in the southeast, whereas the ingredients in the same product made out west would have totally different ingredients, even though the guaranteed analysis for protein, fat and fiber are the same. Purina had something like 91 mills to my knowledge (not all of them make horse feed), and they do not use fixed formulas.

You really can’t compare unless you have a feed tag from the Purina product (and even then you might not be able to compare because Purina often lists ingredients in AAFCO categories rather than actual ingredients).

Purina supersport