The use of fattening feed additives during the finishing period of beef cattle can increase the assimilation (synthetic) metabolism of the cattle, so that the nitrogenous substances in the feed are converted more into the bovine body proteins, the carbohydrates are converted into fats more, or the bovine body is changed differently. The concentration of hormones is used to coordinate the function of the endocrine system to increase the amount of hormones that are beneficial to the growth of the body in the body, or to control the metabolic rate of the bovine body so as to reduce the amount of activity of the cattle, thereby reducing the maintenance needs of the cattle and making more nutrition available. Substances, especially the accumulation of energy substances in the body ... and ultimately accelerate the weight gain of beef cattle during the finishing period. Many research and production practices at home and abroad have proved that the use of fat-enhancing additives can increase the daily weight gain by 10% to 20% and the feed conversion efficiency by 8% to 20%, which can shorten the fattening period of beef cattle and achieve higher economic benefits. . The fattening feed additives commonly used for beef cattle include: 1. Sodium bicarbonate. The acidic environment of cattle rumen has an important influence on the activity of microorganisms, especially when changing the type of feed (such as the conversion from roughage to high-concentrate fertilizer during the late finishing of fattening), which can significantly reduce the pH of the rumen and affect the rumen microorganisms. Activities, and thus affect the conversion of feed. Adding 0.7% sodium bicarbonate to beef cattle feed can maintain the pH of the rumen in the range of 6.2 to 6.8, which is consistent with the proliferation of rumen microbes, giving the rumen the best possible digestive capacity and 9% higher feed intake. Increased daily gain by more than 10%. 66.7 grams of sodium bicarbonate and 33.3 grams of potassium dihydrogen phosphate constitute a buffer. The first phase of the finishing phase accounts for 1% of the dry matter of the cow's diet, and the second phase adds 0.8%, the daily weight gain can increase by 15.4%, and the concentrate consumption. A decrease of 13.08%, and the incidence of digestive system diseases is greatly reduced. 2. Monensin is also known as rumen. It is hardly absorbed in the digestive tract of cattle and, therefore, there is generally no problem of residue in the tissues and transfer to edible livestock products. The application of monensin in the high-concentration finishing of beef cattle can increase the production of propionic acid, reduce the degradation of protein in the rumen, increase the total amount of protein in the rumen, and increase the net energy and nitrogen utilization. , And thinning the intestinal wall is conducive to the penetration and absorption of nutrients, the total number of ciliates and bacteria in the rumen increased 1 to 2 times, but also stimulate the pituitary gland secrete hormones to promote growth and development, thereby increasing the rate of weight gain. Feed 5.3 to 360 milligrams per cow per day into the concentrate feed, or combine the concentrate with monensin and roughage to feed, typically increasing the weight gain by 15% to 20%. 3. Rare earth. It is a general term for 17 elements of lanthanoid elements and lanthanum. Rare earth 1 000 ppm was added to the finisher's diet. According to the results, the daily weight gain increased by 26.63%, the feed ratio decreased by 21.30%, and the feed conversion efficiency increased by 23.39%. 4. Sodium bromide. After 0.5 g dissolved in water and fed with concentrate, it can limit cattle activity, reduce energy consumption, and increase the deposition of nutrients in the body. Daily weight gain increased by 16.4% to 17.7%, ketone body weight and meat weight increased by 8.6% and 10.5%, respectively. 5. Probiotics. It is a kind of microbial agent that can replace or balance one or more microbes in the microecological system of the gastrointestinal tract, such as Lactobacillus, Bifidobacteria, Bacillus subtilis, etc. It can stimulate proliferation of self bacteria and inhibit it. The growth of other strains of bacteria; the production of enzymes, the synthesis of B vitamins, the enhancement of immune function, the promotion of appetite, the reduction of the incidence of gastrointestinal diseases, with a fat-promoting effect. The amount added is generally 0.02% to 0.2% of the cattle diet. 6. Non-protein nitrogen. The most commonly used is urea. Cows are ruminants, and rumen microbes can use urea nitrogen to synthesize proteins (true proteins) and use them for cattle in the intestine. In the modern cattle industry, non-protein nitrogen such as urea has been widely used as a substitute for some of the protein in cattle feed to increase the digestibility of crude fiber in low-protein feeds and increase nitrogen retention and weight gain. The nutritional value per 1 kg of urea is equivalent to the protein nutritional value of 5 kg soybean cake or 7 kg flaxseed cake. The current methods for feeding urea include: mixing 20-30 grams of urea per 100 kilograms of body weight in the concentrate or mixing the concentrate mixed with urea with roughage; or directly dissolving the urea in water and mixing or spraying on the hay. Or urea, corn and sugar paddles are mixed into liquid feed; or add urea to make silage feed. The added amount is generally 0.2% to 0.5% of the wet weight of the storage. It has been proposed that 3.4 to 4 kg of urea and 1.5 to 2 kg of ammonium sulfate are formulated as aqueous solutions, respectively, and the silage is mixed with 1 ton of silage, which not only increases the sulfur content, but also increases the It can also reduce the amount of urea, reduce costs, and provide better feeding results. Beef cattle fed non-protein nitrogen can increase weight gain by 10% to 20%. 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