By Shawn Cai

23 Oct, 2021

The common yeast strains are not adapted to the environmental temperature in the rumen, nor can they tolerate the high temperature during granulation process. Angel selected special heat resistant yeast strains for ruminants and using a special production process to fit these problems

Yeast is a treasure all over, widely used in food, pharmaceutical and chemical, bio-energy, animal husbandry and other sectors. There are only 3 kinds of yeasts legally used in feed ingredients and feed additives in China, namely Saccharomyces cerevisiae, Candida utilis, and Phaffia rhodozyma. Usually the yeast we mention is Saccharomyces cerevisiae, and Saccharomyces cerevisiae is also the most widely used strain. In ruminants, yeast is the first choice for improving digestibility and preventing acidosis.

Table 1: The main yeast species used in feed ingredients and additives in China

The main yeast species used in feed ingredients and additives in China

Theoretically, it takes about 2 grams of carbohydrates to grow 1 gram of yeast dry matter. Different yeasts have great differences in their ability to utilize carbon sources. Compared with bacteria, Saccharomyces cerevisiae is very different in cell size, cell wall composition, growth temperature, etc. The optimum growth temperature for ordinary yeast is 20-30°C. At the same time, yeast also has the characteristics of a small proportion of the gastrointestinal flora, non-intestinal colonizing bacteria, insensitive to antibiotics, and not resistant to antibiotics.

Table 2: Basic physiological and biochemical characteristics of Saccharomyces cerevisia

e Basic physiological and biochemical characteristics of Saccharomyces cerevisiae

Table 3: Comparison of characteristics of Saccharomyces cerevisiae and Bacteria.

Basic physiological and biochemical characteristics of Saccharomyces cerevisiae Table 3: Comparison of characteristics of Saccharomyces cerevisiae and Bacteria.

Tell you a secret: not all active yeasts are suitable for ruminants！

For ruminants, the normal temperature of the rumen is 39-39.5°C, and the temperature of the rumen is even higher during special periods, even reaching 41-42°C. Therefore, the common yeast strains that are not adapted to the environmental temperature in the rumen have a weak regulatory effect on ruminant rumen health. Angel Yeast Co., Ltd. united 14 technology centers to select yeast strains for ruminants from strain collection and screening to molecular identification, strain domestication, strain performance reverse evaluation, and application effect research-Yeavita R can adapt well to the environment in the rumen. National CNAS laboratory and domestic and foreign universities evaluation and certification, its rumen adaptability and oxygen consumption capacity are much higher than ordinary non-special bacteria in the market, More than 80 experimental studies have confirmed that Yeavita R can improve digestibility, prevent acidosis, stably improve animal production performance and improve health.

Research on Rumen Adaptability and Oxygen Consumption

Research on Rumen Adaptability and Oxygen Consumption

Note: The picture shows the proliferation of yeast under simulated rumen conditions in vitro

The picture shows the influence of different yeasts on the redox potential.

Note: The picture shows the influence of different yeasts on the redox potential.

The above figure shows that Yeavita R Significantly reduce the redox potential.

Although ruminant yeast has a specific strain and can play a stable role in the rumen, for some current TMR full-price pellets or calf and lamb pellets, the pelleting temperature reaches 75-80℃ during the production process. How can we ensure It can enter the rumen of animals alive.Ordinary yeast will not work, nor will the yeast used for ruminating, so how should we choose and use it.

Angel Yeast Co., Ltd. selects yeast strains for ruminant use, and through a special drying process, the live yeast is made into hard spherical yeast pellets, which can withstand the pelleting temperature and solve the problem of using yeast in pellet feed.

how to choose better yeast for ruminant pellets

Let me tell you another secret: not all active yeasts are heat resistant!

Below we share an actual use case of a customer. The following table shows the results of sampling and testing the number of viable bacteria after adding different yeast products after granulation. It can be seen that the survival rate of the high temperature resistant Yeavita R+ after granulation reached 83%. The survival rate of heat-resistant yeast products from other manufacturers is only 5.6%.

Table 4: Comparison of survival rate of Yeavita R+ on pellets

Comparison of survival rate of Yeavita R+ on pellets

Yeavita R+ can tolerate the granulation process, and its application effect on the pellets of sheep and beef cattle is also very advantageous. The experiment used a high proportion corn TMR pellet diet in the fattening stage as a model to study the effect of adding Yeavita R+ on the performance of mutton sheep. After a 56-day feeding experiment, the addition of Yeavita R+ to the high corn ratio diet significantly increased daily gain, lowered the feed-to-meat ratio, and slightly increased feed intake.

Table 5: The effect of adding Yeavita R+ to the diet on the growth performance of mutton sheep

The effect of adding Yeavita R+ to the diet on the growth performance of mutton sheep

Note: Test period 56d, Total mixed pellet diet.

The above experiment shows that Yeavita R Significantly Increase daily weight gain and reduce feed to meat ratio of mutton sheep.

Which kind of yeast is good for ruminant pellets?

The answer is definitely Yeavita R+, a high-temperature-resistant yeast, for ruminating.

Published by Shawn Cai

Senior Engineer of Animal Nutrition Division

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