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Adding sodium bicarbonate to the feed can effectively improve the digestion ability of livestock and poultry, accelerate the utilization of nutrients and the discharge of harmful substances, and increase the speed of weight gain. It can keep the resistance and immunity of livestock and poultry in the best state and improve the ability to resist stress. It plays an important role in preventing diseases and ensuring the healthy growth of livestock and poultry.

Feed additives refer to small or trace substances added in the process of feed production, processing and use. They are used in small amounts but have significant effects. Feed additives are the inevitable raw materials used in the modern feed industry. They have obvious effects on strengthening the

China is a big country in the world for laying hens. The commodity hens account for 40% to 45% of the world's stock. In recent years, the annual output of eggs is about 20 million tons. In the collection, grading, packaging, transportation, storage and processing of eggs, eggs are inevitably affected by external forces, resulting in cracking or cracking of the eggshell, resulting in losses of more than 500 million yuan per year, to producers and wholesalers. The economic losses caused are very large. At this time, the influence of trace elements on eggs is crucial. This paper will review the existing mechanisms of the effects of trace elements on eggshell quality.

China's feed additive industry is developing rapidly. Trace elements are one of the essential nutrients for animals and have irreplaceable physiological and biochemical effects. Changes in trace elements in animals not only affect the body itself, but also affect the growth, reproduction, metabolism and production of toxins in the body. More and more people are aware of the importance of trace elements, which has led to some problems in the trace element feed additive market. This article will detail these issues and suggest solutions.