Chickens all know that the stress of chickens is not high. Under high temperature environment, the demand for energy from chickens is low and feed intake will be reduced. This is the main reason for the decline in production performance. Therefore, it is an extremely important and effective technique to adjust the feeding standards and diet formulas and to ferment with the gold baby feed starter to ensure the nutrient intake of the chickens and improve the feed palatability.
1. Relationship between high temperature and feed intake When the ambient temperature is between 18°C ​​and 32°C, the feed intake of the flock decreases by 1.72% for every 1°C increase in temperature. Increasing dietary carbohydrate content at high temperatures Increasing energy concentration as a supplement to reduced feed intake is not beneficial for maintaining high egg production capacity, as the addition of carbohydrates increases the production of heat. A more ideal method is to use fat instead of carbohydrates, because fat heat consumption is low, adding fat in the diet can not only increase the metabolic energy value of the diet, but also improve the palatability, promote chicken feeding, reduce the body Increase heat, reduce feed circulation in the gastrointestinal tract, promote nutrient absorption, and increase feed utilization efficiency. The adjustment of energy concentration in the diet should be based on the principle of minimizing the production of heat loss. When raising the dietary energy concentration, other nutrients must be adjusted to maintain the balance of the diet.
2, increase the nutrient concentration of compound feed This is an effective means to reduce the decline in the productivity of laying hens during the hot season. To ensure that the basic nutritional needs of the layer daily (such as 18g crude protein, energy of 1. 151 MJ, 360 mg methionine, 720 mg lysine, 3.5 g calcium, 0.4 g available phosphorus and essential vitamins , minerals, etc.) in order to compensate for the lack of nutrients caused by high temperature stress, to some extent alleviate the harm of heat stress. To meet nutritional needs, it has been reported that the concentration of energy should be increased by 10% and the concentration of other nutrients should be increased by 25% during heat stress.
3. Raising Dietary Protein Levels Because chickens' needs for protein and amino acids are independent of the ambient temperature, the protein requirements of chickens do not change during heat stress. However, when the temperature of the environment rises, the feed intake of the chicken decreases, so the protein level in the feed should be increased. At higher temperatures, heat stress directly affects the egg production rate of the flock. Even if protein levels are not improved, high protein diets have a good effect on egg production at high temperatures (30°C-33°C). , can improve the quality of eggs, and has a buffer effect on the adverse effects of high temperature. Under mild heat stress, increasing dietary protein and calcium do not alleviate the effects of heat stress on performance but increase egg weight. The protein level of commercial feed is generally adjusted from 16.5% to 17.6%.
4. Adjust the protein energy ratio of the diet. In the heat stress, should the protein energy ratio of the broiler diet be increased to keep the crude protein supply unchanged? Because the special dynamic effect (SDA) of the high protein diet is very harmful, So the concept is different. The effective method is not to raise the level of dietary protein, but to increase the concentration of essential amino acids. It has been reported that methionine can reduce the susceptibility of broilers to heat stress. Corn-soybean-based diets require methionine for better broiler performance. Some people think that under stress conditions, broilers deposit more fat in the abdomen, between 7 °C -32 °C abdominal fat and temperature has a direct relationship and has nothing to do with protein levels. But lowering the ratio of energy to protein helps lower abdominal fat.
5, to increase dietary amino acid levels due to metabolic protein production of heat consumption is much higher than carbohydrates and fats, increase dietary protein to increase the body's metabolic heat production. Therefore, adding protein not only increases the cost of feeding, but also aggravates heat stress to a certain extent. Dietary amino acids do not have to be absorbed directly into the body through the breakdown of intestinal proteases, which can reduce the burden of heat-stress-damaged intestines and can quickly supplement the body. Therefore, most scholars advocate using low-protein diets and supplementing essential amino acids to ensure the amount of essential amino acids needed to reduce the heat consumption during protein utilization. Maintaining the level of essential amino acids can improve the growth rate and survival rate of broilers. Internal ammonia concentration.
6. Note that the amino acid balance of the dietary amino acid balance diet is also affected by the ambient temperature. The optimal temperature for arginine/lysine is 1:10, while in high temperature conditions, the ratio should be increased to 1: (1. 27 - 1.37). Preparing diets based on available amino acids will help reduce the burden of heat consumption. Research on amino acid addition to heat stress has just started. There is a lack of mature additions. Some studies have found that methionine and lysine can relieve heat stress. They are two basic amino acids that must be added. Their amount is generally methionine per day. 360 m containing lysine 720 mg.
7, pay attention to the diet of calcium and phosphorus balance heat stress can affect the quality of the shell (shell thinning, brittle), the reason for the addition of layer hens uterine glycogenase and vitamin D activity decreased, the layer of blood calcium is also a decrease important reason. To ensure that chickens ingest at least 3.5 g of calcium per day, the calcium content of the diet can be increased to 4%, but the ratio of calcium to phosphorus should be kept at 4:1. Although it has been reported that increasing available phosphorus in diets can alleviate the decline in production performance caused by heat stress in laying hens, excessive phosphorus limits the release of bone calcium and inhibits the formation of calcium carbonates, resulting in excessively high phosphorus ratios. Phosphorus diets have an impact on eggshell quality and also affect egg weight. Therefore, to avoid excessive phosphorus in the diet. For example, the feed intake of layer chickens at heat stress (3a°C) is 92% at 20°C, so to maintain the daily calcium and available phosphorus intake, they should increase their concentrations to 108.7%, respectively. The ratio of calcium to available phosphorus in the grain is adjusted to (4.0% to 4.5%): (0.40% to 0.45%) is better.
friendly reminder:
All dry fermentation beds that are not "Golden Baby" brands are fake and shoddy products.
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