Every hen produces a medium-sized egg, and it discharges 2-2.2 grams of calcium along with the eggshell, and the absorption rate of calcium in the feed is 50%-60%, so for every egg produced, it requires 4-4.4 grams of calcium. However, it is not always better to feed chickens with calcium. Excessive calcium in the diet will reduce feed palatability and affect feed intake. Insufficient intake of calcium will affect eggshell quality and egg production. Therefore, the key to solving this contradiction is timely and reasonable calcium supplementation to laying hens.

First, calcium supplementation should be performed before laying hens. In order for hens to produce more eggs and produce high-quality eggs, calcium supplements should be added two weeks before opening. Practice has proved that the content of calcium in laying hens' broilers is the best 3%-3.5%. In the peak period of egg production (the egg laying rate is more than 85%), the calcium content in the diet can increase to 3.6%-4%. This will not only prevent the lack of calcium in the chicken, but will not use the calcium source in the bone marrow, and it can ensure the calcium requirement for the chicken during normal egg production. In addition to supplementing calcium in the feed, a box filled with shell powder, eggshell powder, and bone meal is placed in the house or at a sporting place for free feeding by the laying hens.

Second, it is necessary to compensate for the absorption of calcium in high-calcium forage hens every day after noon for the differences in climate, light, calcium source, quality, and individual absorption of calcium. In the 8-10 hours after the chickens lay their eggs, the body does not need calcium for the time being. It is only when the egg shells are formed at night that they need to absorb calcium to promote eggshell formation. Due to the limited ability of the hen to retain calcium in the body, the survival rate is only half, especially powdery calcium. After the intake of the hen is absorbed and utilized, excess will be excreted soon. Therefore, the effect of calcium on the chicken is best at 12:00-18:00 every day, and it is best to feed the powdered calcium feed, and it can be used when it is left to form at night when the eggshell is formed. At this time, most of the calcium enters the blood just at night when the egg shell is deposited, so that the chicken does not need to use the calcium in the bone marrow to fully utilize the calcium source in the feed to form the eggshell, which helps maintain the calcium balance of the chicken. Making chickens more productive is also good for ensuring the healthy development of chickens.

Third, the amount of calcium required to be fed to the layered calcium laying hens is quite large, as much as 3.5%-4%. Therefore, it is necessary to ensure that the calcium feed is added, and it is best to add calcium alone to the chicken. The supplementary method can mix 1/3 of the calcium feed with 2/3 of the calcium feed in the powder and supply it to the laying hen separately for feeding.

Fourth, the proportion of calcium and phosphorus in the diet should be properly composed of calcium and phosphorus bone tissue, and the chicken's ability to absorb calcium is affected by phosphorus, only calcium and phosphorus ratio to maintain balance, in order to better use of calcium, while calcium, The right amount of bone meal or calcium phosphate should be fed to keep the calcium and phosphorus ratio in chicken feed at a 4:1 equilibrium.

Fifth, add appropriate amount of vitamin C Vitamin C can increase thyroid activity and promote calcium metabolism in the body, so that calcium dissolves out of the bone marrow, so that the blood calcium content increases, thus improving the composition of the eggshell, improve eggshell hardness. Therefore, vitamin C should be added to the diet. It is advisable to add 50 mg/kg feed.

Six, vitamin D supplementation chickens are generally not easy to lack except in winter, and cage chickens should pay attention to supplement. Vitamin D3 promotes absorption of calcium by the small intestine and promotes normal calcification of the bone marrow, which is conducive to improving eggshell quality and laying rate. Egg-laying chickens should contain vitamin D500 international units per kilogram of feed. When the content is insufficient, cod liver oil or synthetic products should be added.

Seven, pay attention to the impact of stress factors Various stress factors can affect the absorption and utilization of calcium in chickens. Stress effects can extend chicken egg production and egg production time. Eggs stay in eggshell glands for a long time and increase calcium deposition, making eggshell color pale. Therefore, in the feeding process, stress should be reduced as much as possible, and the proper breeding density and temperature should be maintained. This will not only increase the color and quality of the eggshell, but also ensure the high and stable production of chickens and increase the breeding efficiency.

A vortex mixer, or vortexer, is a simple device used commonly in laboratories to mix small vials of liquid. It consists of an electric motor with the drive shaft oriented vertically and attached to a cupped rubber piece mounted slightly off-center. As the motor runs the rubber piece oscillates rapidly in a circular motion. When a test tube or other appropriate container is pressed into the rubber cup (or touched to its edge) the motion is transmitted to the liquid inside and a vortex is created. Most vortex mixers are designed with 2 or 4-plate formats, have variable speed settings ranging from 100 to 3,200 rpm, and can be set to run continuously, or to run only when downward pressure is applied to the rubber piece.

 

Vortex mixers are quite commonplace in bioscience laboratories. In cell culture and microbiology laboratories they may be used to suspend cells. In a biochemical or analytical laboratory they may be used to mix the reagents of an assay or to mix an experimental sample and a dilutant.

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