Why use a multi vitamin supplement?
The vitamin content of most feed stuffs reduces rapidly over time, therefore the older the feed the lower the vitamin content.
For example, fresh grass is a good source of vitamins A and E but 80% of the vitamin E is lost during the process of hay making and vitamin A is lost at about 10% per month thereafter. This means that hay a year old may contain zero levels of these vital nutrients.
It is essential therefore to feed a multi vitamin supplement in order to ensure an adequate supply of these vital nutrients, especially if you are feeding high levels of straights and forage and low levels of compound feeds.