Participation in Forum on November 28, 2023
This is probably one of the fundamental questions of modern microbiology, which has always focused on the search for criteria for identifying microorganisms. Remember Bergey's classic bacteria guide? The morphology of the colonies was supported by the composition of the nutrient medium. Then the criterion was the ability to metabolize specific carbohydrates. And now 16s sequencing has been added t ...
Participation in Forum on November 13, 2023
@Alvaro Dubois Dear Alvaro, thanks for discussion participance. I think we should return to the original topic of our discussion. There are good programs for optimizing diets, the issue is only in the matrix values of the added enzymes or in mixtures of these enzymes. The difficulty is that program developers must enter matrix values into the database of their programs. But they need assurances th ...
Dr. Fiodor S. Marchenkov likes the comment:
@Dr. Fiodor S. Marchenkov, totally agree, but there is also a big problem that impacts response of enzymes, most individual matrices are also evaluated under conditions that do not apply in practice, look values from phytase commercial phytases, blame 5 - 10 improvement on amino acids digestibilities at 500 ftu, but several New publications confirm papers published with Dr. Parsons lab, matrices d ...
Participation in Forum on October 26, 2023
@Luis Fernando Vergamini Luna Yes it is. It is not correct to use matrix indicators of individual enzymes, since in practice a mixture of enzymes is always used. For example, if you want to use only xylanase, then a reasonable question arises: does your feed consist of only wheat? And of course, it is wrong to simply use the sum of matrix values, since enzymes interact both with substrates and wit ...
Dr. Fiodor S. Marchenkov likes the comment:
Hi Pirzado M.ZakriaThere is a matrix for multienzymes use. The general rule is: minerals from Phytase, energy from NSP and protein from protease (as 100%). From other enzymes, we take 50-25%. This is a simplification, of course, and the composition must be considered individually. For exact calculation please ask the producer/distributor as DSM, Danisco, AB or Addiseo.
Dr. Fiodor S. Marchenkov likes the video:
Dr. Piotr Stanislawski shares his experience with Engormix members regarding the use of enzymes in poultry diets and gives his advice on how to do it properly.
Participation in Forum on May 30, 2023
Luis Fernando Vergamini Luna, I absolutely agree. All metabolic pathways need to be in balance. NEAA are an important part of metabolic participants.
Dr. Fiodor S. Marchenkov likes the comment:
Just to put some pepper to the discussion, approximately 60% of the Methionine requirement from modern broilers comes from vegetable sources.
Congratulation on the discussion about nonessential amino acids, that is truly great, and a better understanding of NEAA in the microbiota patterns are welcomed.
Dr. Fiodor S. Marchenkov likes the comment:
Dr. Fiodor S. Marchenkov Many of those so-called nutritionally nonessential amino acids (NEAAs) are potent regulators of gene expression and metabolism in animals. Glutamine is a great example. Some NEAAs are the major metabolic fuels for enterocytes of the small intestine in a species-specific manner to support the intestinal integrity and function. There should be not such a thing as vegetable m ...
Dr. Fiodor S. Marchenkov likes the comment:
I should like also to comment from Dr. Marchenkov regarding "vegetable methionine". As Dr. Wu correctly states, methionine is methionine; an amino acid with a clearly defined structure INDEPENDENT of the source. I have seen numerous products claiming to be "Herbal methionine" and these materials are not methionine, and do not contribute methionine. When used in correctly balanced and formulated di ...