Total Mixed Ration (TMR) is designed to maintain health and maximize production. UBC research has shown that cows preferentially sort and consume the smaller grain particles and discriminate against the longer forage components. This can result in improper nutrition (decreased production) as well as sub-acute ruminal acidosis (SARA). One way to judge if this is happening at your farm is to use a forage particle separator to compare the feed that is offered with what is left at the end of the day and then adjust your feeding ratios accordingly.
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