In the late summer and early autumn period, it is the initial stage of spring-rearing hens. The management of chickens during this period is related to the economic efficiency of chicken farms (households). Therefore, we must master the main points of feeding and management at this stage.
First, timely change and feed the transition material. In general, 20-week-old chickens are fed pre-egg feed, also called transitional feeds, with 1% calcium and 16.5% crude protein. When reloading, half a month's time is used to complete the reloading process. Avoid rushing to avoid causing diarrhea. When the egg production rate reaches 2% to 5%, calcium in the feed should be 3.4% to 3.5%, and crude protein should reach 18%.
Second, control the initial body condition. While recharging calcium, we should do a good job in the uniformity of population development. We must group large, medium, and small hens in groups and transfer them periodically. Avoid sudden increase in material or slashing material, the effectiveness of which can be expressed after 3 weeks, should not be rushed. The weight of light-weight chickens should not exceed the size of medium-large chickens, so as to avoid affecting sexual maturity due to fat deposition.
Third, control the temperature of housing. The optimum temperature for egg laying is 18°C~23°C. When the ambient temperature is lower than 18°C, the nutrients needed to maintain the demand will increase; when the temperature is lower than 13°C, the growth and development of laying hens and egg production will be affected, and the temperature of the chicken house will be too low to be timely. When the feed is increased, the chicken will postpone production due to lack of energy.
Fourth, adjust the relative humidity and ventilation. The relative humidity of a chicken house is required to be 55% to 65%, and the relative humidity of a house from 1 to 3 days old is 70%, and it can be reduced to about 50% after 4 weeks of age. Humidity should not be too high, otherwise the chicks will appear filthy feathers, lack of appetite, sickness and illness, delaying sexual maturity and postponing production. If the ventilation is poor, harmful gases in the air will increase, the humidity will increase, and the oxygen content will decrease. This will cause the reserve hens to be stunted and delay production.
Fifth, lighting control and adjustment. Reserve hens generally enter sexual maturity at 15 weeks of age, during which period the natural light is gradually reduced. Due to the short illumination time and the long time to reach sexual maturity, supplemental illumination should be started after 15 weeks of age to meet the needs of sexual maturity. In general, the illumination time after 15 weeks of age should be maintained at the light intensity of 15 weeks of age, but the light intensity can not be too strong to prevent the occurrence of chicken gizzards. It is advisable that the initial illumination time of laying hens be 13-17 hours daily.
Six, for clean drinking water. It is very important for hens to drink water at the beginning of the year. Generally, a hen needs 100 to 200 grams of water every day. Therefore, laying hens must not be deprived of water. It is best to use flowing water tanks to supply water, and 2 to 3 times of dilute brine can be supplied each week to improve the physique of the layer and increase the feed intake. Some carrots or green feed can also be fed daily to improve the quality of the eggs.
Catalysts can induce chemical reactions to change and make chemical reactions faster or slower. Catalysts are also called catalysts in industry. The composition, chemical properties and quality of the catalyst did not change before and after the reaction. It mainly includes solid acid-base catalyst, molecular sieve catalyst, metal catalyst, metal oxide and metal sulfide catalyst, and complex catalyst.
1. Acid-base catalysts: Petroleum refining and petrochemical industry are the largest application fields of catalysts, occupying an important position in the national economy. Acid catalysis plays an important role in petroleum refining and petrochemical industry. Solid acids are further divided into Blans Te Um (B acid) and Lewis acid (L acid). Typical solid base catalysts: MgO, CaO, SrO2, etc; typical solid L acid catalysts: AlCl3, FeCl3, etc.
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