Hay refers to the timely harvesting of wild grasses or artificial cultivated grasses that have been dried on the ground, dried by straw, or mechanically dried. It is characterized by green and blue color, rich in protein, minerals, and vitamins, and has good palatability. Compared with succulent feeds and concentrate feeds, hay is bulky, contains many celluloses and is difficult to digest, but it is an important part of the diet. In addition to supplying dairy cows with nutrients, hay also balances physiologically and promotes gastrointestinal motility. In particular, in the early spring when it is converted from grazing to grazing, cows often diarrhea because of the low consumption of cellulose. The remedy is to supplement the cow with 2 to 3 kg of hay each night. Hay is also an important raw material for forming milk fat. During the process of breaking down cellulose by rumen microorganisms, volatile fatty acids, such as acetic acid, propionic acid, butyric acid and fatty substances, can be produced. These substances are important raw materials for synthetic milk fat. If the amount of hay is low, the milk fat percentage of the cow will decrease. In summary, it can be seen that hay is the most important forage for dairy cows. Dairy cows have a large rumen volume and have the special function of eating large amount of hay. The daily feed intake can reach more than 3% of the cow's weight. The hay in the diet should not be less than 5 kg. The cows should be allowed to feed freely. The moisture content of hay is less than 15%, green color, soft stems, more leaves, less impurities, should be tied or stored in a storage shed to prevent nutrient losses. Hay should be chopped when feeding and it should be about 3 cm in length.
Biologics are drugs made from complex molecules manufactured using living microorganisms, plants, or animal cells.Anti-rabies Vacine for Human is a preparation of rabies fixed virus CTN-1V inoculated into Vero cell , which is used for the prevention of the rabies disease.
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