First, the cause of the low fertilization rate of eggs
1. Genetic factors Different breed breeders have different heat resistance, heat stress response, and fertility. For example, broiler breeders have poorer heat tolerance than egg breeders and have low fertilization rates; similarly for egg breeders, brown breeder breeders (or large body weight) have poorer heat resistance than white breeder breeders (or small bodies). The rate of decline in fertilization rate is large; in the same breed of chickens, the fertility rate of large-age chickens is much lower than that of chickens with smaller ages.
2, the environmental factors of high temperature on the rooster semen quality has a great impact, resulting in reduced fertility. Ambient temperature at 20 °C can promote testicular development and sperm production, no adverse effects on sperm at 30 °C, but the temperature reached 38 °C on the temporary inhibition of sperm. At the same time, semen (should be maintained at 10 °C ~ 25 °C, 20min transfusion) if in a high temperature environment, the quality gradually decreased, sperm death accelerated, fertility rate decreased.
3. Stress factors Because the summer temperature is above 35°C for a long time, the breeders are under heat stress for a long time, which seriously affects the feed intake, feed conversion rate, weight gain, egg production, and semen quality of chickens. ; can also cause various diseases. This leads to changes in the physiological function of the chicken body and metabolic disorders, which greatly reduces the fertility rate.
4, the disease factor high temperature and high temperature in summer, so that bacteria multiply quickly, and stress response to promote disease, thereby affecting the fertilization rate. The most common E. coli disease has a severe impact on the fertility rate; at the same time, sulfa drugs, furazolidone, certain anti-coccidial drugs (such as monensin) have a certain impact on the fertilization rate.
5. Nutritional factors As a result of the high temperature, the chicken's feed intake is insufficient, and the conversion rate is reduced, so that it can not meet the production needs of chickens; at the same time, the vitamins and other nutrients in the feed are quickly lost in the high temperature environment, resulting in chicken nutrition. Bad; high temperatures increase the amount of drinking water in the chickens and excrete them faster, leading to the loss of certain minerals. As a result, the constitution and semen quality of the flock are reduced, and the fertilization rate is reduced.
6. Management factors Due to the hot weather, people are not responsible for their work, poor feeding and management of chickens, and low fertilization rates of artificial insemination will reduce the fertility rate.
Second, the solution
1, cooling, such as: install the curtain, cooling system or spray water cooling.
2. Plant trees or change the structure of the house to reduce direct sunlight and reduce the temperature inside the house.
3, increase ventilation, reduce the rearing density to improve the home environment.
4. Increase the nutrient concentration of feed to meet the nutritional needs of breeders (especially cockerels), especially the addition of vitamins, minerals and proteins.
5. Add some substances in the feed to increase the fertilization rate of the eggs. Such as: in the feed plus sedatives, V? C and anti-heat stress additives (Chinese herbal medicine), etc., to ease the stress response; add NaHCO? in the feed, adjust and make body fluids acid-base balance, to help digestion; add in semen Antibiotics (penicillin) improve semen quality.
6, the use of young, strong cock to replace the week-old cock can increase the fertility rate.
7, strengthen the feeding and management to improve the responsibility of the fertilized staff.
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