Summer is coming, and for dairy farmers, a battle against heat stress is about to start. Heat stress has a great impact on milk production, milk quality, reproductive performance, and disease. Common measures to alleviate heat stress include physical cooling, dietary optimization, and improved feeding management. A large number of application demonstrations show that adding yeast-derived functional products to the diet will relieve the cow's heat stress from different ways, so how do we choose yeast source products? Please listen to Xiaobian for you.
Regulates rumen health, improves feed intake, and improves digestibility . The feed intake of special dairy cows under circumstance is reduced under heat stress, the demand for maintenance is increased, the secretion of saliva is reduced, the concentration and proportion of concentrate are increased, and the risk of ruminal acidosis is increased. The growth of rumen microbes is hindered and the digestibility of feed is significantly reduced.
The Fuzhou ruminant-specific yeast strain is screened from the rumen and is a special yeast strain for ruminant. On the one hand, the ruminant-specific yeast can create a rumen anaerobic environment by consuming excess oxygen in the rumen, and grow nutrients and metabolic factors in the rumen to promote the growth of rumen fiber-decomposing bacteria and fungi, improve forage digestibility, and stabilize feed intake. On the other hand, it was found by RT-PCR that the ruminant-specific yeast can stabilize the rumen pH and prevent acidosis by regulating the balance between lactic acid-producing bacteria and lactic acid-utilizing bacteria, and is also beneficial to the improvement of digestibility and the increase of feed intake. The use of ruminant-specific yeast in many dairy farms at home and abroad for several years has shown that under heat stress, the digestibility can be significantly improved, and the feed intake can be improved. On average, the loss per day can be reduced by 5 kg per milk.
Improves body metabolism, increases nutrient absorption, and increases milk fat, milk protein -yeast cell wall heat stress in summer leads to lower milk fat and milk protein in dairy cows. On the one hand, the intake of nutrients is insufficient due to the decrease in feed intake, and on the other hand, because blood is more Flow to the body surface for heat dissipation, resulting in weakened rumen function, insufficient metabolism of the body, and reduced absorption of nutrients. The yeast cell wall is mainly composed of mannan and β-glucan. The experimental study found that mannan can promote the growth of rumen microbes, increase the production of volatile fatty acids (VFA) and microbial protein (MCP), and increase the milk fat and milk protein content. --glucan can adsorb pathogenic bacteria and mycotoxins, reduce the damage of rumen microorganisms by pathogenic bacteria and mycotoxins, and stabilize the normal metabolic function of rumen. The effect of yeast cell wall on many dairy farms at home and abroad shows that adding yeast cell wall can increase milk milk fat and milk protein content by 0.2-0.3 percentage points, and significantly reduce the total number of bacteria and somatic cells in milk and improve milk quality.
Enhance immunity, increase anti-oxidation, reduce somatic cells, and improve conception rate . During the summer heat stress of yeast selenium, the immunity of dairy cows decreases, the somatic cells rise, and the conception rate decreases. Compared with other seasons, the summer pregnancy rate can be reduced by 50. -60%.
As a source of organic selenium, yeast selenium is not easily affected by rumen microbes in the rumen. It directly enters the abdomen and is digested and absorbed in the form of selenomethionine. Its bioavailability is significantly higher than that of sodium selenite. Tests have shown that yeast selenium can improve the body's specific immune and non-specific immunity, enhance the body's disease resistance, reduce the incidence of mastitis, and reduce the number of somatic cells in milk. Yeast cell wall has been repeatedly used in many dairy farms at home and abroad: it can reduce milk somatic cells by 30-50%.
In summer, heat stress causes the body's blood to flow more to the body surface for heat dissipation, and the blood flowing through the intestine is significantly reduced. In the absence of blood supply of oxygen and energy, intestinal cells produce large amounts of reactive oxygen species. On the one hand, reactive oxygen species destroy the intestinal cell membrane, damage the cell structure and function, affect the absorption and utilization of nutrients; on the other hand, the hormone metabolism disorder, affecting the body's metabolism. As a component of the glutathione peroxidase activity center, selenium participates in the body's antioxidant system. Yeast selenium can also improve the absorption of nutrients by improving the body's antioxidant capacity, maintaining intestinal cell structure and function.
Due to its high utilization rate, yeast selenium can deposit more in tissues and organs of the body. As a component of sperm cell membrane, it can effectively protect sperm and improve the vitality and integrity of bulls. For cows, yeast selenium participates in the regulation of reproductive hormones in dams, which facilitates fertilization and embryo implantation, and improves the pregnancy rate of cows. At the same time, the antioxidant capacity of yeast selenium also contributes to the development of the embryo and comprehensively improves reproductive performance.
(An Qi Yeast Co., Ltd. Technology Director)
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