[QUOTE=borntobewild129;7848665]
Can anyone enlighten me on the fixed formula thing about purina?[/QUOTE]
Fixed formula means that every bag will have the same pounds of alfalfa, soybean meal, beet bulp etc. Every bag should be nearly identical. Many Purina feeds just guarantee that the nutritional analysis will be the same but not necessarily that the ingredients will be the same. So one lot may have more wheat in it, one might have less alfalfa… as long as it all tests out to their guaranteed analysis (%protein, %fiber, %vitamins, etc) they call it good. They do this to save cost since grain and by product pricing can change from month to month and they may have changes in the types and amount of by products available from within the company from other manufacturing processes.
Consumers prefer a fixed formula feed because there is no sudden diet changes going from one bag to the next that could upset the horse’s digestion process.
I don’t know if Purina Senior is fixed formula or not. Some lines are, some aren’t. TC Sr is fixed formula.