The fertilization rate of the eggs not only directly affects the hatching rate, but also affects the economic benefits of the breeder farm. Therefore, raising the fertilization rate of breeding eggs can effectively increase the number of feeding chicks and maximize the utilization potential of breeding eggs to achieve a multiplier effect. There are many factors affecting the fertilization rate of the eggs. The main factors are described below. First, the choice of breeder Rooster's robust or not, is a very important aspect affecting the fertilization rate. In breeder brooding and bred, special attention should be paid to the development of the rooster. Weighing periodically, sexually mature roosters must meet the body weight standards stipulated in the Breeding Manual. Too thin cocks must be eliminated and cannot be used as seed. In the process of catching chickens, special attention should be paid to not damaging the feet and legs of the rooster so as not to affect the subsequent cock mating. Incorrectly breaking cock also affects the cop's mating. The low sperm activity and the low number of cocks also affect the fertilization rate of the eggs. The normal requirement is to have at least 50 million to 100 million sperm per ejaculation. Second, male and female ratio configuration cock and hen normal mating can produce fertilized eggs, hatch chicks. Therefore, the ratio of rooster to hen is a problem that should be considered firstly by breeder flocks. If the male and female are out of balance, both the number of roosters and the number of hens will reduce the fertilization rate of the breeder eggs. The male to female ratio is generally determined to be 1:8 to 12, that is, 8 to 12 hens and 1 rooster. Third, the lack of vitamins and vitamin supplements are essential for poultry to maintain growth, normal physiological function and metabolism. In particular, the lack of vitamin A, vitamin E and vitamin B2 have a greater impact on the fertilization rate of eggs. 1, vitamin A deficiency of vitamin A, can cause hens decreased egg production rate, embryo misalignment; cock sexual function decreased, semen quality degradation. The required amount of vitamin A in the breeder requires 4000IU/kg in the diet, and vitamin A deficiency can be increased by more than 3 times the normal requirement for vitamins. 2, vitamin E, vitamin E, also known as tocopherol, its role is mainly antioxidant. In the absence of vitamin E, the cock is susceptible to degenerative testicular degeneration and reproductive dysfunction, resulting in low fertilization rates and low hatching rates in laying hens. According to the author's experience in production, adding 20 to 40 mg/kg of vitamin E in the feed for breeders can increase the fertilization rate and hatching rate of 5% to 10%. When vitamin E deficiency occurs, 0.5% vegetable oil may be added to the diet or vitamin E may be added directly. 3, Vitamin B2 Vitamin B2, is the prosthetic group of the yellow enzyme in the body, in the biological oxidation of the respiratory chain plays a role in hydrogen transfer. In the absence of vitamin B2, hens show reduced egg production, low fertilization rates, and reduced hatching rates. When vitamin B2 deficiency occurs, vitamin B2 injection can be used or vitamin B2 tablets can be taken internally. The dosage of the breeder chicken is 10 mg/dose, for 7 days. Fourth, the lack of trace elements and supplements 1, iron and iron is the body must constitute the hemoglobin essential substances, the egg also contains iron, so the fertilization rate of iron and hatching eggs, hatching rate. The normal requirement of iron for chicken is 80 mg/kg body weight. Iron can be obtained from ferrous sulfate, ferrous carbonate, ferrous oxide, and the like. Can be added to the feed 132 ~ 199mg/kg ferrous sulfate (content of 20.1%). 2, copper and copper have a catalytic effect on the use of iron, can promote the absorption of iron. In the absence of copper, the absorption of iron by the body will be reduced, the egg production will be affected, and the fertilization rate and hatching rate of the breeding eggs will be reduced. Copper can be obtained from copper sulfate, copper oxide, and the like. The normal requirement is 4 mg/kg, and usually copper sulfate (25.5%) is added to the diet at 20 mg/kg. 3. Cobalt and cobalt are essential elements for erythropoiesis. In the absence of cobalt, egg production rate, fertilization rate, and hatching rate can be reduced. Cobalt can be obtained from vitamin B12, cobalt sulfate, cobalt oxide, and the like. Fifth, the impact of external factors and Countermeasures 1, the impact of diseases, mycotoxins Many diseases can affect the breeder's egg production rate and the quality of eggs, thus affecting the fertilization rate of eggs. Such as chicken mold, bronchitis and other diseases. As long as the immunization of breeding chickens is well done in the production, correct immunization procedures are established, and disinfection is carried out regularly to ensure the environmental health and safety. In case of prevention, the disease can be controlled and the impact of the disease on the fertility rate can be reduced. Some molds produce toxins in the feed during growth, such as aflatoxin of Aspergillus flavus, which can cause the growth rate of chickens to decrease, the laying rate of eggs to fall, and damage to the liver, kidneys, and other major organs, as well as affect the breeders. No mildewed feed should be fed during production to prevent mycotoxins from affecting the flock. 2. Effect of parasites Parasites can cause mechanical damage to chicken skin, take away nutrients from chickens, secrete toxins, cause malnutrition in the body, reduce hens spawning, and do not mate with cockerels, which greatly reduces the fertility rate. In the prevention and control, we must first deal with chicken excrement, we must improve the internal and external environmental sanitation of the chicken house, strengthen the feeding and management, in order to enhance the body resistance, annual deworming 1 to 2 times. 3, the impact of the environment chicken house temperature is low, will inhibit the normal growth of rooster testes and reduce the fertilization rate. The shed should be able to discharge the cloudy air in time and introduce fresh air. The ammonia level in the house should not exceed 20%. The optimum temperature for the house is 18-25°C and the relative humidity is 75%-85%. Whether the light plan is correct or not, the size of the stocking density will also affect the fertilization rate of the eggs. The lighting plan can effectively control the sexual maturity of breeders. Therefore, the correct lighting plan and light intensity can ensure the normal sexual development of breeders. Excessive breeding density results in difficulty in mating of male and female chickens, which is also an important external factor affecting the fertilization rate of eggs.

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