Total mixed rations (TMRs) seem to be the feeding method of choice, at least for nongrazing
situations (Spain et al., 1993). Despite the need for an extra piece of equipment
(maybe more), the benefits in animal performance have been shown to far outweigh the
costs of implementing the concept. The principles of TMRs caught on a few decades
ago, but developments in the implementation and preparation are continuing. There are
many configurations of equipment and layouts which accomplish TMR delivery. Many
producers are beyond the question of "should I use TMR?"; the question now is "what is
the optimal way to deliver my TMR?".
The term and acronym of TMR has been widely misused over the years. In the true
sense of the intent, a TMR is a totally mixed total ration or a TMTR. If the complete
ration is not in the mix, it is not total. If the ration is not properly blended, portions of
what is delivered are not total. Proper management of a TMR delivery system requires
control of several facets which can control feed uniformity.
Quality control issues regarding TMR delivery include:
Uniformity among batches
Uniformity within batches
Particle size distribution
Minimizing labor requirements (but this is usually more a function of
non-mixer equipment than the mixer itself)
Low utilization of energy input (minor issue generally)
Long equipment life
The intent of this manuscript is to discuss mixer management in light of these quality
control issues. Ways in which mixers are selected and used can dramatically affect
each of these.
Total mixed rations (TMRs) seem to be the feeding method of choice, at least for nongrazingsituations (Spain et al., 1993). Despite the need for an extra piece of equipment(maybe more), the benefits in animal performance have been shown to far outweigh thecosts of implementing the concept. The principles of TMRs caught on a few decadesago, but developments in the implementation and preparation are continuing. There aremany configurations of equipment and layouts which accomplish TMR delivery. Manyproducers are beyond the question of "should I use TMR?"; the question now is "what isthe optimal way to deliver my TMR?".The term and acronym of TMR has been widely misused over the years. In the truesense of the intent, a TMR is a totally mixed total ration or a TMTR. If the completeration is not in the mix, it is not total. If the ration is not properly blended, portions ofwhat is delivered are not total. Proper management of a TMR delivery system requirescontrol of several facets which can control feed uniformity.Quality control issues regarding TMR delivery include: Uniformity among batches Uniformity within batches Particle size distribution Minimizing labor requirements (but this is usually more a function ofnon-mixer equipment than the mixer itself) Low utilization of energy input (minor issue generally) Long equipment lifeThe intent of this manuscript is to discuss mixer management in light of these qualitycontrol issues. Ways in which mixers are selected and used can dramatically affecteach of these.
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