It is best to add a small amount of oil to the layer-laying diets in summer and summer, which can not only increase the metabolic energy value, but also promote the intake of food, reduce body heat, and promote the absorption of nutrients. The heat or heat stress of laying hens is not allowed to be used in conventional feeds except for bacteriocin zinc. Other antibiotics should be restricted.
Design Principles
Firstly, we must adapt to market demand and have market competitiveness; Second, we must have scientific advancement, apply new knowledge and new achievements in the field of animal nutrition in the formula; Third, we must have economy, and feed formula should be under the premise of ensuring the nutrition of livestock and poultry. The lowest cost; the fourth is to be operational, to meet the market demand, according to the company's own conditions, make full use of a variety of raw materials to ensure the stability of feed quality; the fifth requirement of the formula must have legitimacy, the application of the country explicitly added feed additive.
Calculation method
In the past, feed formulation calculations used simple methods such as trial and error, cross, and diagonal methods. Now feed mills mostly use computer-designed feed formulations, which not only greatly increase the computational efficiency, but also consider the relationship between nutrition and cost, increase resource utilization, and reduce feed costs.
Environmental issues
According to the digestible amino acid content and the ideal protein model, the chickens can be combined with a balanced diet to ensure that the amino acid content is in full compliance with the animal's maintenance and production needs. The feed conversion efficiency is maximized and nutrient excretion can be minimized, thereby reducing environmental pollution. . It has been proved that diets for laying hens calculated and formulated according to the digestible amino acid and ideal protein models can reduce dietary protein levels by 2.5%, while their production performance does not diminish, and the nitrogen content of chicken manure decreases by 20%.
Use other growth-promoting additives instead of antibiotics. Enzyme preparations can accelerate the degradation of nutrients in the digestive tract of animals, and can degrade macromolecular substances that are not easily absorbed by animals into easily absorbed small molecules, thereby facilitating the digestion and absorption of nutrients and improving the utilization of feed. Phytase can use phytate in feed ingredients to reduce phosphorus pollution from animal waste to the environment.
A kind of microbiological feed additive that probiotics have a beneficial effect on animals by improving the balance of digestive tract microflora in animals. It can inhibit and repel the growth and reproduction of pathogenic microorganisms such as E. coli and Salmonella, and promote the growth and reproduction of beneficial microorganisms such as lactic acid bacteria. . Therefore, in the animal's digestive tract, a microbial flora dominated by beneficial microorganisms is established, which reduces the chance of animals becoming ill and promotes animal growth.
The Chinese herbal medicine additive is a product of traditional Chinese medicine theory that is unique to China for a long period of time. It has the functions of Shun Qixiaoshi, sedation, deworming, depyrogenation, detoxification, bactericidal and anti-inflammatory. It can promote animal metabolism, enhance animal disease resistance, and improve Feed conversion rate.
Precautions for the preparation of concentrated feed
Feed mills usually design 20%-40% concentrates. The proportion is too low, users need to cooperate with the increase in the type of feed, the cost is too high, the feed plant is not easy to control the final product; the ratio is too high, it will lose the significance of concentration. Usually, chicks are designed with 30%-50% concentrates, 30%-40% for chickens, and 35%-40% for laying hens. There are two kinds of calculation methods: First, it is calculated from compound feed; second, it is calculated from the set ratio, and then formulated according to this ratio. When the user applies the concentrate, it should be used according to the formula recommended by the feed mill, so that it is easy to carry out quality control. When the user changes raw materials, the proportioning calculation should be performed again to meet the main indicators.
Seasonal adjustment
High summer temperatures cause a decline in the feed intake of laying hens and an appropriate increase in the concentration of feed nutrients. The increase will depend on the reduction in feed intake, generally increasing by about 5%-10%. For egg production peak protein and metabolic energy levels, they should be adjusted to 17.6% and 12.3 MJ/kg from 16.5% and 11.5 MJ/kg, respectively, and the other nutrient concentration adjustments should be roughly the same.
It is best to add a small amount of oil to the layer-laying diets in summer and summer, which can not only increase the metabolic energy value, but also promote the intake of food, reduce body heat, and promote the absorption of nutrients. Can also be used to replace the powder stone powder quality and reliable, but also stone powder, shell powder mixed use, so that the ratio of shell powder and stone powder is about 1:3-4 or so, raw materials that do not contain protein and energy, such as zeolite powder, Maifan stone powder To use less, add less than 3%.
The heat or heat stress of laying hens is not allowed to be used in conventional feeds except for bacteriocin zinc. Other antibiotics should be restricted. Studies have shown that allicin (essential oils) inhibits or kills a variety of staphylococcus, dysentery bacilli, E. coli, typhoid bacillus, fungi, viruses, amoeba, coccidia and aphids, especially for bacillary dysentery and Enteritis has good curative effect, and promotes feeding, aids digestion, and promotes egg production. In addition, allicin can bind with vitamin B1 to prevent the latter from being destroyed, so it can increase the absorption of effective vitamin B1. Natural garlic can be added directly (with skin) in the 1%-2% ratio of laying hens' feed. Gypsum research into fine, according to feed 0.3% -1.0% ratio of mixed feed, there is antipyretic Qingwei fire effect.
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