The problem of maturity of lighting control regulation and delayed production time is a problem that is difficult to solve in the semi-open chicken house. From the winter to the summer, this kind of henhouse will generally produce early, if not shading, with the extension of the light. As early as production is started, due to the immunity of breeding chickens in the brooding and breeding stage, the number of stress reactions also increases, often resulting in early body weight failing to reach the standard, and late feeding again, in pursuit of the body weight to reach the standard at sexual maturity. But the skeleton is small, and there are many fats near the anus, which can easily cause dystocia, which in turn causes the other chicken to lose its anus. It can be seen that poor light control, resulting in premature sexual maturation is an important factor in the induction of scrofula. No matter whether the body weight is up to standard or not, it is easy to cause anal fistula, and there is not much relationship with the morning and evening of peak egg production.
In 1997, two ancestral chicken farms, two breeds of new hens from March to April opened one after another, opening date of production 115 ~ 120d. The egg production rate is 50% at the age of 150 days, and the egg production rate is 85% at the age of 160 days. At the same time see more double yellow eggs, these two fields are semi-open chicken house, there is no shading facilities, in the broiler chicken stage is catching up with daylight hours longer, beyond the 8h light of the bred phase. One field changed the peak early, and the weight was too high. In another field, the weight was too light for the peak material to be late, and the egg production rate was changed more than 80%.
Illumination is one of the indispensable environmental conditions for living organisms. Long-term illumination can promote sexual maturation for young livestock. If people take some shading measures, change the intensity of light, time and color, can effectively control the growth and development of chickens, regulate sexual maturity, prevent and reduce the occurrence of fistula fistula. The light intensity is very important. After observing the closed chicken house and the semi-open chicken house, it was found that the closed chicken house had the same stepped rearing, the same density, and the artificial light. Little, almost none. According to relevant reports, the light intensity during the laying period is 32 to 65 lx, and the house is quite large during intensive breeding. The light that the light bulb should emit is often absorbed by ceilings, walls, equipment, and appliances. In addition, there are a lot of dust, light bulbs, old bulbs, and long distances in the house, and the actual light reaching the ground is only about half. In the semi-open house, the minimum intensity of daylight is 10.8lx, reaching a maximum of 100 lux. In a chicken farm, cleaning was performed. The glass windows that had not been wiped in the semi-open shed for several years were wiped clean, and branches that were not pruned for a few years were cut off. As a result, a scrofula occurred.
As for the color of light, tests have shown that red can delay sexual maturation, make the flock quiet, reduce lice, and the egg production also slightly increases, but the fertility rate is low. This can be compensated with skilled artificial insemination techniques. Huang Guang also can postpone sexual maturity and increase egg weight, but feed returns are reduced and egg production is reduced. Both green and blue light have the effect of accelerating sexual maturity, but blue light also has the advantage of increasing the weight gain rate, increasing the cocking power of cockerels, and reducing the licking rate. Therefore, for open and semi-open chicken houses, the intensity and color of light should be adjusted during the rearing stage, early to middle stage, and late stage to prevent the occurrence of anal fistula.
YT-H711
YT-H711
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