Special yeast YeaVita R for dairy cow
November 27th, 2019
By Xiangqian Xiao
YeaVita R is a special yeast strain selected from rumen for improving feed digestibility, regulating rumen health and improving ruminant production performance.
1 The function of yeast in rumen
1.1 Improve digestibility
Yeast is a facultative anaerobic bacteria. It can use oxygen to create an anaerobic environment for rumen microorganisms in the presence of oxygen. It is conducive to the growth and reproduction of anaerobic bacteria such as cellulose-decomposing bacteria, protein-decomposing bacteria and fat-decomposing bacteria, thus improving feed digestibility.
1.2 Prevention of acidosis
Under the action of oxygen consumption of live yeast, it promotes the proliferation of lactic acid-utilizing bacteria, inhibits the proliferation of lactic acid-producing bacteria and reduces the accumulation of lactic acid in the rumen. At the same time, live yeast also uses a small amount of carbohydrate substrates in the rumen to comprehensively prevent rumen acidosis.
1.3 Increase milk production
Yeast is also a direct source of nutrition. Live yeast is an excellent source of protein and amino acid because of its rich protein content. At the same time, yeast is rich in vitamins and some essential trace elements, digestive enzymes and unknown growth factors. Therefore, live yeast can be used not only as probiotics to regulate gastrointestinal flora, but also as nutritional active ingredients or nutrient substrates for rumen microorganisms and dairy cows. With the increase of feed digestibility and the direct nutrition from yeast, the milk yield and quality of dairy cows can be improved.
2 Not all live yeast is suitable for dairy cows
YeaVita R is a special yeast strain selected from rumen for improving feed digestibility, regulating rumen health and improving ruminant production performance. Angel Yeast has carried out more than 80 experiments through its own experimental platform and external joint research platform, such as China Agricultural University, Huazhong Agricultural University, Sichuan Agricultural University, Texas Tech University, and University of Arizona in the United States, which further confirmed that this specific live yeast is suitable for ruminants.
Not all live yeast can adapt to the rumen environment. By simulating the rumen environment, the growth curves of different active yeasts at different pH and temperature were measured to observe the adaptation of active yeasts to the rumen environment. From Figure 1, it can be seen that YeaVita R is superior to common yeast in proliferation under simulated rumen conditions in vitro, thus better adapted to the rumen environment.
Figure 1. Proliferation of YeaVita R and other live yeast under simulated rumen conditions in vitro
Oxidation-reduction potential is a measure of oxygen content in rumen. The normal growth and reproduction of rumen microorganisms require anaerobic environment, and trace oxygen can be quickly metabolized with food intake. However, ruminant and other physiological activities lead to a large amount of oxygen intake into the rumen every day. If there is a large amount of oxygen in the rumen, it will promote the reproduction of aerobic bacteria such as lactic acid producing bacteria, inhibit the reproduction of anaerobic bacteria such as lactic acid utilizing bacteria, and reduce the pH value of the rumen environment, leading to acidosis. Figure 2 shows that YeaVita R can consume more oxygen in the rumen, reduce the redox potential in the rumen, promote the growth of rumen microorganisms, improve digestibility and prevent acidosis by real-time detection of fistula cows.
Figure 2. Effects of YeaVita R and other live yeasts on oxidation-reduction potentials
The in vitro digestibility of dry matter (IVDMD) method has the advantages of simple operation, good repeatability and easy standardization, so it has been widely used. It is the most widely used technology to evaluate the feeding value of dairy cow feed. It is a method of digesting feed samples in vitro with rumen juice and estimating the digestibility of organic matter by the ratio of gases produced during digestion. As can be seen from Figure 3, YeaVita R has the highest dry matter digestibility in vitro because YeaVita R consumes more oxygen to promote the growth of cellulolytic bacteria.
Figure 3. Comparison of in vitro dry matter digestibility (IVDMD) among different live yeast
Dairy cows produce milk regularly during lactation. The milk yield of cows increases gradually after delivery. The milk yield of low-yielding cows reaches its peak 20-30 days after delivery, and that of high-yielding cows reaches its peak 40-50 days after delivery. The peak period is long or short. The peak period usually lasts for about 20 to 60 days and then gradually decreases. The extent of decline varies according to cow's body condition, feeding level, gestation period, breed and production performance. Figure 4 showed that the average milk yield of YeaVita R group decreased by 0.44 kg after 30 days, while that of common yeast decreased by 1.94 kg. Therefore, adding YeaVita R can slow down the decline of milk production, and the effect is better than that of common yeast.
Figure 4. Effects of different live yeast on milk yield
The above data can prove that live yeast is indeed helpful to regulate rumen microflora and increase milk production. But not all live yeasts show the same effect. Some live yeast can not even survive in the rumen. Dairy cows need special live yeasts. Only special yeast screened can regulate rumen health and improve milk production and production efficiency.
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.
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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