Effects of ruminant yeast on feed digestibility and milk yield of dairy cows

November 15th, 2018

Kang Kun, Nie Qin, Tan ZhigangAngel, Animal Nutrition, China

120 dairy cows were divided into control group and yeast group according to the principle of parity, lactation days and milk yield. The yeast group added 2 g yeast per cow per day on the basis of the control group. The experiment lasted 35 days. The results showed that the whole grain (corn + cottonseed) residue and total residue on the first layer of the yeast group were about 58% lower than that of the control group, and the milk yield of the whole yeast group was 1.90 kg higher than that of the control group. The results showed that adding Fubang ruminant yeast could improve feed digestibility and increase milk production.

The unbalanced proportion of concentrate and crude oil will increase the risk of rumen acidosis, and the digestion and utilization rate of feed will decrease directly the production benefit.

Fubon ruminant yeast is a safe and efficient special strain of Saccharomyces cerevisiae from the rumen. It does not contain any carriers and has more than 20 billion live bacteria per gram. The results showed that living yeast could regulate the rumen microflora, inhibit the number of lactic acid producing bacteria such as Streptococcus bovis, increase the number of lactic acid utilizing bacteria such as Megacoccus Escherichia, increase the rumen pH value and alleviate acidosis. At the same time, the number of cellulolytic bacteria such as rumen coccus and the activity of degrading enzyme were increased, and the utilization rate of roughage was increased.

Materials and methods

1 Test material

The Fubon ruminant yeast is supplied by Angel Yeast Co. Ltd.. More than 20 billion live bacteria per gram

2 Test time and place

The experiment was conducted in a dairy farm in Fujian from February 2014 to March 2014, and lasted 35 days.

3 Test design

3.1 Test animals and design

A total of 120 lactating cows were selected in the experiment, and they were divided into 2 treatment groups (i.e., control group and yeast group, as shown in table 1) according to the principle of the same number of fetuses, number of lactation days, and amount of milk production. Ruminant yeast was added to the yeast group (2g/ head/day), but not to the control group. In the yeast group, the ruminant yeast was mixed with the concentrate before adding the TMR mixer for blending.

Table 1 Test grouping 

  The average child time Average number of lactation days Average milk production before test(kg)
Control 2.94 79.17±27.36 35.65±4.72
Yeast 3.00 80.06±26.06 35.62±5.50

Note: the amount of milk produced before the test is calculated according to the data of milk produced during the week before the test.

3.2Test daily ration and breeding management

The experiment adopted the basic daily ration of cattle farm, which was mainly composed of fine feed, whole corn silage, alfalfa, leymus chinensis and beer lees. Feed three times a day, and eat and drink freely. The milking is done by rotary milking three times in the morning, middle and evening.

Sample collection and index measurement:

Average weekly milk production: calculate the total daily milk production of each cow according to the data of three times of milking recorded by the turntable milking system, and then calculate the average weekly milk production of each treatment group.

Fecal sample analysis: 10 samples of fresh feces from the experimental group and the control group were collected randomly on day 1 and day 35, respectively, and cargill analysis screen was used for simple digestibility analysis.

The data processing

Statistical analysis was performed using excel, and the differences between groups were briefly analyzed by calculating the average.

Analysis of test results

Average weekly milk production in each treatment group was compared

From table 1, it can be seen that the milk production of the two treatment groups before the test was close. From week 2, the milk production of the yeast group was significantly higher than that of the control group, and the daily average milk production of the whole yeast group was 1.90kg higher than that of the control group. Compared with that before the test, the milk production in the control group decreased by 1.89kg at week 5, which was mainly related to the lactation stage of the test. The average lactation days at week 5 were around 115 days, when the milk production began to decline. However, the amount of milk produced in the yeast group was only 0.05kg lower than that before the test, indicating that after adding ruminant yeast, the milk peak period was prolonged and the production was maintained.

Table 2 comparison of average weekly milk production in each treatment group (unit: kg)

  Before the test 2nd week 3rd week 4th week 5th week The whole period(1.5~2.10)
Control 35.65 34.54 34.70 35.30 33.76 34.57
Yeast 35.61 37.19 36.40 36.70 35.56 36.47

Note: the dataof milk production in the first week was wrong due to the recording of milking equipment and could not be counted.

The residues (corn + cottonseed) in the first layer screen of each treatment group were compared

It can be seen from table 3 that after adding ruminant yeast treatment, the number of grains on the first layer is significantly reduced, with a reduction of nearly 60%. The number of residue in the first layer of the control group was significantly higher than that before the experiment, which was mainly affected by the composition of corn silage in different layers. However, the number of grains in the experimental group was significantly reduced under the condition of consistent basic diets, indicating that the addition of ruminant yeast increased the digestibility of pellet feed and reduced the residue in feces.

Table 3 comparison of the number of intact grains in the first layer between different treatments

  1st day 35th day
Control (pieces) 15 34
Yeast (pieces) 21 14
Reduction (%) - 58.82%


Control group                       The first layer of the test group

Figure 1. Comparison of whole-grain residues in the first layer between different treatments

Comparison of residues of the first screen in each treatment group

As can be seen from table 4 and figure 1, both absolute quantity and relative proportion of the first layer of the experimental group were much lower than that of the control group, with a decrease of 58.82%. Combined with the data in table 3, the overall results showed that adding ruminant yeast significantly improved feed digestion.

Table 4. Comparison of residues of the first sieve between treatments on the 35th day 

  The total amount The 1st  layer The 2nd, 3rd layer
Control 1.87kg Absolute amount(kg) 0.34 0.76
Relative proportion(%) 31 69
Yeast 1.86kg Absolute amount(kg) 0.14 0.79
Relative proportion(%) 15 85

Economic benefit analysis

The yeast group was fed with 2g ruminant yeast every day, while the average daily increase of 1.90kg per cow during the whole trial period was 1.90kg compared with the control group, which was calculated based on the local milk price of 4.0 yuan /kg, which would increase the daily income of each cow by about 7.0 yuan. During the whole trial, 60 cows in the whole trial group increased by 7*60*35= 14,700 yuan more than those in the control group, and the economic benefit was significantly improved.


The addition of Fubon ruminant yeast (2g/head/day) on high-yielding cows can increase milk production by improving feed digestion.


About Angel Animal Nutrition:

Fubon is a brand of Angel Animal Nutrition. Fubon is committed to developing natural, efficient microbial feed derived from yeast with Angel's leading technology in yeast industry, providing the best service solutions for the nutrition and health in animals. Angel Animal Nutrition creates value for global feed and animal agriculture customers through continuously upgraded products and professional services.

About Angel:

Angel Yeast Company is a high-tech listed company specializing in yeast and biotech. Product business covers Yeast and Baking, Yeast Extract-Savoury, Nutrition & Health and Biotechnology fields. It is one of the world's leading companies in the yeast industry. Angel has 12 holding subsidiaries and provides products and services for more than 150 countries and regions.

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