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Abstract: With the continuous extension of the breeding cycle of laying hens, the production performance and egg quality of laying hens have been seriously challenged. After the feed "ban", the use of functional feed additives to protect the intestinal tract is becoming more and more common. How to screen effective functional additives is very important for the healthy breeding production of laying hens. In this paper, the application of enzyme preparation, probiotics, plant essential oil and acidifier in improving the intestinal health of laying hens in recent years was reviewed.
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There are three national quality standards for corn in China, which are the most basic national standard for corn, the national standard for feed corn and the national standard for industrial corn. These three standards are interrelated and have their own characteristics. Corn national standard is a general standard for bulk corn, which is widely used in the purchase, storage, transportation, processing and sales of commodity corn. The feed corn standards and industrial corn standards are more targeted, and there are some changes and adjustments on the basis of the national standard of corn. The common denominator of these three criteria is water, impurities, imperfect grains, mold grains, etc. as the main indicators to measure the quality of corn;
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Production performance: it can mainly increase egg weight, reduce feed-egg ratio, increase chicken weight, especially eliminate chickens; Nutrition: increase energy value, improve energy utilization rate, reduce feed intake, and reduce more heat consumption when chickens feed in large quantities, especially in summer; Production and processing: reduce dust, reduce machine wear, easy granulation, and improve yield. How to distinguish the advantages and disadvantages of grease? The simplest and most effective method is to look at, smell and taste three times, that is, first observe the color, then smell the smell, freshness, a small amount of pungent nose, etc., and then taste whether it is salty, bitter, spicy, etc. If the front does not pass, it will be rejected directly, and then the chemical indexes, acid value, peroxide value, impurities and salt will be found.
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(1) temperature, insects, insects in addition to bite, pollute the feed, but also cause the increase of temperature and humidity. Insects are very sensitive to temperature changes, when the temperature is 15. 5 ℃ or below, reproduction is very slow, or even stop; when the temperature is as high as 41 ℃ or above, it is not easy to exist. The most suitable temperature for insect reproduction is about 29 ℃, and the life cycle of insects is about 30 days, and the reproduction is very fast. Generally, when pests are found, fumigation can be used to disinfect and kill insects. (2) humidity with the increase of humidity, mold rapid reproduction, so that the temperature and humidity in the warehouse are increased, followed by musty and sour taste appeared one after another, humidity to control in 6
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For a long time, the abuse of antibiotics in livestock and poultry breeding has caused various hazards and has become a worldwide problem. The long-term use of antibiotics will cause serious harm to livestock and poultry: first, the animal produces drug-resistant bacteria, inhibits cellular immunity and humoral immunity, seriously damages the function of animal immune cells, reduces animal immunity and disease resistance, and even causes immune failure; second, the residual antibiotics in animal products enter the human body through the food chain, causing people to be indirectly exposed to antibiotics, which seriously affects the effect of antibiotic treatment when the human body is sick. Therefore, in the current animal husbandry industry, no anti-feed is the trend of the times, 2
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In the heat stress environment, the chicken to maintain normal physiology and production needs to have adequate nutritional supplements, and when the ambient temperature exceeds 27 ℃, the feed intake of laying hens will decline with the increase of temperature. In order to solve this contradiction, it is necessary to adjust the feed nutrition according to the feed intake of chickens and increase the nutrient concentration to make up for the deficiency of energy, crude protein, mineral and multivitamin intake due to heat stress. 1. Energy concentration adjusts the reduction of feed intake of laying hens under heat stress, and a large number of studies have shown that increasing the content of energy substances in feed can improve the production of heat-stressed poultry. Currently a more
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Due to the large increase in the price of feed raw materials in recent time, there are adulteration inclusions in feed raw materials, and the adulteration techniques are renovated, making it difficult to identify the quality of raw materials, resulting in high feed intake and small egg weight of chickens on the market, affecting production performance. In order to control the quality of feed, the quality of raw materials must be well controlled. Several common adulteration methods and identification methods of raw materials are introduced as follows: bran is the most commonly used raw material, but the adulteration phenomenon is also serious, often mixed with talcum powder, rice bran, etc. The identification of this situation can be inserted into bran by hand and extracted. If there is white powder on the hand and it is not easy to shake off, it is proved to be mixed with talcum powder.
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We eat eggs every day. The main nutrients of eggs are water, protein, fat, and some vitamins, minerals, and cholesterol. These nutrients are very easy to be absorbed by the body, therefore, the nutritional value of eggs is very high. In the age of material shortage, eating eggs means that your living conditions are very good. In recent years, with the abundance of materials and the growth of wealth, more and more people feel that eggs have no taste, and they don't like to eat eggs, or they only eat egg whites and don't eat egg yolks. They are afraid that the cholesterol in eggs will be high. Will get chronic disease. For those who are choosy about eggs, less than the teacher has three opinions to discuss together. 1, when you should be outside
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With the large-scale development of laying hens production, the continuous emergence of old problems shows that many of the realities are not optimistic, and the problems cannot be ignored! The constant recurrence of liver problems, including the quality of eggshells in the later period, is not related to liver problems! First understand the five major functions of the liver: 1. Metabolic function: ① sugar metabolism: the starch and sugar in the feed are digested and absorbed through the intestine to provide energy for laying hens. ② Protein metabolism: The liver is the only synthetic organ of albumin in the body of laying hens. The production, maintenance and regulation of globulin, enzyme protein and plasma protein all involve the liver.
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