In order to increase the milk production of dairy cows, the cattle farmers mostly increase the feed of the concentrate. After the cows eat a lot of concentrate, they will rapidly ferment in the rumen to form a large amount of acidic substances, and the coarse materials will be eaten less. The amount of saliva secretion is also reduced. The results often cause indigestion, and even cause true stomach shift, ketosis, and can lead to acidosis. Currently, the best solution is to add the right amount of buffer to the cow's diet.
1 Why add buffer?
First, it can increase the feed intake of dairy cows, increase and stabilize the milk production of dairy cows, and maintain the milk fat percentage. The second is to keep the hydrogen ion concentration of the rumen and intestinal contents and body fluids of the cattle normal, buffer the influence of volatile fatty acids in the rumen on the hydrogen ion concentration, prevent the rumen acidity from rising, and keep the pH of the rumen at 6.2-6.8 ( In this range, the rumen has the best digestive function) to facilitate the effective reproduction of bacteria in the rumen. The third is to dilute the rumen fluid, increase the efflux speed of the rumen fluid, increase the concentration of acetic acid, increase the ratio of acetic acid and propionic acid, and then increase the milk fat percentage. Fourth, it can effectively prevent rumen acidosis in cattle, improve its disease resistance and promote the health of cattle. For example, the plant ash has the functions of disinfecting, sterilizing, astringent, cleaning the gastrointestinal tract to absorb harmful components in the intestine, and neutralizing gastric acid. The author's experiment with grass ash as a buffer showed that 3.5% of the ash was added to the dairy cow's diet after delivery, and the feed intake and milk yield increased by 10% and 13%, respectively. obviously decrease.
2 conditions required to add buffers
2.1 high proportion of corn silage diet
Corn greens contain higher moisture (60-70%), easily fermentable carbohydrates (>30%) and lower pH (3.9-4.2). For the maximum feed intake of dairy cows, the optimum pH value of green fodder should be 5.6. The corn green material requires cutting as short as possible for compaction. The short silage material does not require too much saliva secretion when the animal feeds due to its own moist nature. At this time, the use of a buffer agent often has a significant effect.
2.2 Humidity of the diet
If the moisture content of the diet exceeds 50% and the water content is fermented, the total dry matter intake of the diet will be reduced by 6-9%; the natural water content generally does not affect the dry matter intake of the feed, just like feeding the green grass. Or the same as the green crop.
2.3 low-fiber diet
Dietary acid detergent fibers (ADF) below 1% affect ruminal and cause rumen acidosis. Foreign scholars report that ADF increases the milk fat percentage by 0.145 percentage points for each 1% increase, and adding 108 grams of baking soda and 54 grams of magnesium oxide can increase the milk fat percentage by 0.145 percentage points. Hay stimulates saliva secretion (feeding per kilogram of medium-quality hay stimulates animals to produce 27.1 liters of saliva), prolongs chewing and ruminating time, and reduces the function of whole-grain water. If the hay is not fed enough, it can lead to an increase in rumen acid production.
2.4 semi-dry silage cut too fine
Eating dry food per kilogram of semi-dry silage stimulates the production of 14.3 litres of saliva. However, eating semi-dry silage that has been cut too thin can cause shortening of ruminant time, increase of rumen chyme outflow rate and decrease of fiber digestibility.
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