In the process of commercial breeding, the egg production rate directly affects the economic benefits of broiler breeder breeding.
The production performance of many flocks tends to fluctuate greatly and cannot meet the manual standards. The main manifestations are: early or late start-up time of breeders; small egg weight, low pass rate of breeding eggs; low egg production peak and short duration ; Eggs drop quickly after the peak of egg production.
The level of egg-laying performance of breeders directly affects the economic benefits of enterprises. Therefore, how to improve the egg-laying performance of breeders has become the most concerned issue for related enterprises.
The uniformity of the flock refers to the percentage of chickens with the same physiological standard or body weight reaching the target body weight (generally within the range of ±10%) in the entire flock. The higher the uniformity value, the better. When the uniformity of broiler breeders is less than 80%, group management need to require.
The uniformity of the flock during the rearing period has an important impact on the height of the egg production peak, the duration of the egg production peak and the egg weight of the hens in the future. Good body weight uniformity encourages breeders to start laying at the same time on the ideal date until the peak of egg production and lasts for a long time, so the method of feeding restriction should be adopted during breeder rearing, combined with weekly weight monitoring, and continuous adjustment Body weight uniformity, so that the breeder flock can reach the ideal body weight uniformity at the appropriate age, and the overweight or thin chickens should adjust the feeding method in time to make them reach the ideal weight.
Chickens with poor uniformity cannot respond synchronously to light, environmental control, vaccines, medication, and feed nutrition, which causes great difficulty in breeding management, and is prone to a vicious circle in which uniformity changes from poor to worse.
Poor uniformity is a key factor in reducing egg production, not only affecting the peak of egg production, but also the persistence of egg production. As shown in the figure below, as the body weight uniformity of broiler breeders decreases, both the peak egg production and the overall egg production rate have a significant downward trend.
The light of the chicken house mainly includes the two aspects of light time and light intensity, and can also be refined to the wavelength of light and the uniformity of light.
Light can stimulate the secretion of gonadal hormones, so it has a significant impact on the egg-laying performance of breeders. Sudden changes in the light program and light intensity will cause the egg production of chickens to decrease, such as sudden delay of light time and increase of light intensity, which may easily cause breeders to prolapse and pecking. Therefore, the lighting program should be stable and the intensity should be appropriate. What the lighting program does change, it’s a gradual transition.
Different light stimulation days also affect the performance of broiler breeders, so choosing the right light age is also critical to maximizing breeder performance.
If the conditions are not ripe, the forced lightening procedure is adopted, which will cause a series of problems such as slow egg production, more double yolks, yolk peritonitis, anus turning, high death rate, and delayed egg production peak.
3.Chicken house environmental management
The closed chicken house must adjust the ventilation or heating of the chicken house to make the temperature, humidity and air quality of the chicken house meet the standard. The suitable temperature of the chicken house during the breeding and laying period is 18-22 °C, and the temperature difference between day and night is less than 3 °C.
Broiler breeders achieve their best production potential only under good house environmental conditions. In winter, the contradiction between heat preservation and ventilation is often encountered. Some breeders are afraid that the chickens will be cold, so they completely seal the chicken house and do not open the exhaust fan for ventilation. The content of harmful gases increases, and the body’s resistance decreases, and respiratory diseases are prone to occur, resulting in a decrease in egg production. Therefore, keep the air in the house fresh and dry, pay attention to heat preservation in winter, and seriously solve the contradiction between ventilation and heat preservation; pay attention to heatstroke prevention and cooling in summer, and provide a good environment for breeders to maximize the egg-laying performance of breeders.