Comparison of MSE and Original XPC from Diamond V


Lark L. Burnham, Ph.D.

Ruminant nutritionist


Both MSE Dry Microbial Concentrate and Original XPC contain at least one strain of Saccharomyces cerevisiae, also known as Brewer’s yeast. No guaranteed analysis is offered regarding numbers of viable organisms in the Diamond V product. The addition of the growth media is actually a diluent in this case, as it does not provide any significant nutritional or probiotic/DFM benefits. The yeast strains in MSE are pure, viable, and guaranteed.


The nutrients listed on the Original XPC product description would be the same regardless if the yeast was viable or not. Probiotic/DFM microorganisms are effective primarily because they out-compete pathogens for nutrients and living space. Dead yeast cannot compete.


No matter what a salesman may tell you, no one species of microorganism is effective, either in every part of the ruminant digestive system, or under every level of stress. The gut is an ecosystem in flux. Diet and stress will determine which species dominate in any one location at any particular time. This includes pathogens.


Ruminant health and productivity is directly related to the health and stability of resident microflora. Stress comes in all levels of severity, and each level can promote proliferation of a variety of pathogens. Severe stress includes weaning, processing, and transportation. Handling and weather are the predominant daily stresses.


Effectiveness of a probiotic/DFM depends on two things: number of different species (yeast, bacteria, and fungi), and the total number of viable microbes (as indicated by CFU, or colony-forming units). Yeast is just one of several microorganisms identified as strong competitors in stressed animals. In addition to S. cerevisiae, MSE contains two Lactobacillus sp., and Streptococcus (Enterobacteria) faecium, all well-known probiotic microbes.