In the United States from the second half of the 1970s, the buffer sodium bicarbonate and baking soda were added to the feed of dairy cows. The purpose is to adjust the pH of the rumen of dairy cows in order to achieve the purpose of increasing milk fat, milk volume and weight gain. The annual demand is more than 100,000 tons. Adding a buffer allows the pH of the rumen to remain relatively in the range of 6.2-6.3, within which the rumen has the best digestive function.
In order to increase the milk production of dairy cows, most of the domestic and foreign countries adopt the “pilot feeding methodâ€, and foreign countries also call the challenge breeding method. That is, from the last 2-3 weeks of cow dry-milk period, until the highest peak of lactation after calving, Give high levels of energy to reduce the incidence of ketosis, maintain weight, and increase milk production.
Due to the increase in feed concentrates, they are rapidly fermented in the rumen to form a large amount of acid, coupled with less raw materials to eat, the natural secretion of saliva is less, the result is likely to cause indigestion, loss of appetite, but also can cause Gastric translocation, ketosis, severe cases can also cause acidosis.
The best solution is to add 100g 150g sodium bicarbonate and 30g magnesium oxide to the diet. The effect of magnesium oxide added is to increase milk fat, and its function is to increase the rumen pH, increase and dilute the rumen fluid. This treatment also reduces the proportion of fatty acids, ie, propionic acid, in the rumen, thus increasing the milk fat percentage.
The trial conducted by Pennsylvania State University further showed that 100g-150g of sodium bicarbonate was added to each end of the day after delivery, compared with the control group. Feed intake and milk production were increased by 9% and 10% respectively. Adding sodium bicarbonate The role was quickly promoted after confirmation by the relevant Japanese authorities.
For dairy cows: Iodine in the general diet can only provide 60%-70% of its requirement. Especially in winter and spring, when silage corn and soybean cake are the main sources of nutrition, iodine deficiency is most likely to occur. Because the iodine content in silage corn is very low, and soybean protein has thyroid-stimulating hormone activity, thereby increasing the demand for iodine in dairy cows, especially for high-yielding dairy cows, more iodine is discharged along with milk, so iodine supplementation in foreign dairy cows is becoming A routine measure. The NRC, ARC, and the former Soviet Union added 5 ppm, 8 ppm, and 1.5 ppm to dairy cows, respectively, based on dry matter in the diet. Wu Di et al.'s three-month trial of supplementation of different doses of iodine to dairy cows showed that, when added at 10 mg and 20 mg KI/head, milk production increased milk production quantitation respectively compared to cows that did not supplement iodine. 7.92% and 8.48%, the milk fat percentage also increased. According to the analysis, it is considered that the addition of 10 mg of KI per head can meet the demand, but it is not beneficial to increase the intake of 1-2 mg for high-yielding dairy cows. High-producing dairy cows are prone to reproductive dysfunction, apparently have estrus symptoms, but do not ovulate or oocyte death, and thus infertility. The reason is that the lack of iodine will reduce the synthesis of thyroxine, reduce even the pituitary luteinizing hormone does not discharge, so the follicle does not break, can not ovulate.
In order to increase the milk production of dairy cows, most of the domestic and foreign countries adopt the “pilot feeding methodâ€, and foreign countries also call the challenge breeding method. That is, from the last 2-3 weeks of cow dry-milk period, until the highest peak of lactation after calving, Give high levels of energy to reduce the incidence of ketosis, maintain weight, and increase milk production.
Due to the increase in feed concentrates, they are rapidly fermented in the rumen to form a large amount of acid, coupled with less raw materials to eat, the natural secretion of saliva is less, the result is likely to cause indigestion, loss of appetite, but also can cause Gastric translocation, ketosis, severe cases can also cause acidosis.
The best solution is to add 100g 150g sodium bicarbonate and 30g magnesium oxide to the diet. The effect of magnesium oxide added is to increase milk fat, and its function is to increase the rumen pH, increase and dilute the rumen fluid. This treatment also reduces the proportion of fatty acids, ie, propionic acid, in the rumen, thus increasing the milk fat percentage.
The trial conducted by Pennsylvania State University further showed that 100g-150g of sodium bicarbonate was added to each end of the day after delivery, compared with the control group. Feed intake and milk production were increased by 9% and 10% respectively. Adding sodium bicarbonate The role was quickly promoted after confirmation by the relevant Japanese authorities.
For dairy cows: Iodine in the general diet can only provide 60%-70% of its requirement. Especially in winter and spring, when silage corn and soybean cake are the main sources of nutrition, iodine deficiency is most likely to occur. Because the iodine content in silage corn is very low, and soybean protein has thyroid-stimulating hormone activity, thereby increasing the demand for iodine in dairy cows, especially for high-yielding dairy cows, more iodine is discharged along with milk, so iodine supplementation in foreign dairy cows is becoming A routine measure. The NRC, ARC, and the former Soviet Union added 5 ppm, 8 ppm, and 1.5 ppm to dairy cows, respectively, based on dry matter in the diet. Wu Di et al.'s three-month trial of supplementation of different doses of iodine to dairy cows showed that, when added at 10 mg and 20 mg KI/head, milk production increased milk production quantitation respectively compared to cows that did not supplement iodine. 7.92% and 8.48%, the milk fat percentage also increased. According to the analysis, it is considered that the addition of 10 mg of KI per head can meet the demand, but it is not beneficial to increase the intake of 1-2 mg for high-yielding dairy cows. High-producing dairy cows are prone to reproductive dysfunction, apparently have estrus symptoms, but do not ovulate or oocyte death, and thus infertility. The reason is that the lack of iodine will reduce the synthesis of thyroxine, reduce even the pituitary luteinizing hormone does not discharge, so the follicle does not break, can not ovulate.
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