It is very important to supplement micronutrients reasonably and it can improve the prevention of disease infection in dairy cows. Here I briefly introduce a little bit about the importance of trace elements for cows:
Selenium selenium and vitamin E play an important role in protecting animals from infection by diseases. The lack of selenium and vitamin E will significantly reduce the cow's ability to resist breast disease. For young cows 60 days before delivery and throughout lactation, 1000 IU vitamin E and 2 mg selenium per head per day before delivery, 600-800 IU vitamin E and 2 mg selenium per day per lactation during lactation, and the disease infection rate decreased during calving 42%, the incidence of clinical mastitis in early lactation decreased by 57%, the whole lactation period decreased by 32%, and the course of disease infection was shortened by 40-50%.
2. The addition of organic zinc to zinc supplemented dairy cows can increase milk production and reduce the number of somatic cells in milk. Zinc is a cofactor for many proteins and enzymes involved in infection and inflammation. Severe zinc deficiency can lead to an increase in the number of neutrophils in the blood and a decrease in lymphocytes. Adding 25 mg/kg of zinc methionine to dairy cows' diets reduced the number of somatic cells in milk by 50%, reduced the incidence rate by 32.6%, and significantly increased milk production.
3. In the absence of copper-supplying copper, the physiological and metabolic functions associated with copper-containing enzymes are destroyed, reducing the cow's resistance to external disease infections, increasing the extent of tissue damage during inflammation, and increasing the number of somatic cells in milk. According to experiments, young cows were divided into two groups 12 weeks before delivery and throughout the lactation period. One group fed basal diets (containing 6-7 mg/kg of copper) without additional copper, and the other group added extra basal diets. At 20 mg/kg copper, the number of breasts infected with the main pathogen was reduced by 22% in the additional copper supplementation group. Although copper deficiency was usually caused by low copper content in the feed, when the sulfur, molybdenum, zinc, or iron content in the feed was too high, It will also reduce the use of copper by cows.
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