| In order to make a stuy of the environment-control models in winter and spring and theireconomic effects of modern super-large scale laying houses, changes of environmentparameters and their relationship with laying performance of five laying houses underdifferent environment-control models, from Shaanxi Da Jiang Conpany, Shaanxi Zheng DaConpany and Beijing De Qing Yuan Modern Super-large Scale Laying hens CultivationEnterprise, have been measured. The five hen houses refer to the two laying houses ofShaanxi Da Jiang Conpany with120,000scale laying house in eight layers under overlappingautomatic control; one laying house with160,000laying hens in eight layers and another onewith40,000laying hens in four layers under overlapping automatic control of Shaanxi ZhengDa Conpany and one hen house with110,000laying hens of Beijing De Qing Yuan Conpanyunder overlapping automatic control. The concentration of carbon dioxide, oxygen andammonia, temperature, wind speed, the concentration of full dust and respirable dust,illumination condition of the above mentioned five laying houses under differentenvironment-control models in winter and spring and economic index such as the laying rate,egg-broken rate, death and culling rate, feed intake, water intake and feed to egg ratio aremeasured. What the results indicate are as follows:1. Characteristics of environmental parameters of laying houses in winter and spring:among the various environment parameters, oxygen concentration changes stably;temperature of laying houses, the concentration of carbon dioxide, ammonia, full dust andrespirable dust firstly increases and then decreases under transverse ventilation model, andit tends to rise with close to the fan under longitudinal and mixing ventilation model. Furthermore, the concentration of carbon dioxide, ammonia and oxygen, temperature, wind speedand dust concentration are significantly related to each other to different degrees(P<0.05) or(P<0.01). The uniformity of light intensity of cages in different positions is poor. The lightintensity of single houses respectively with120,000,160,000and110,000scale laying housevariates more significantly than that of the single house with40,000scale.2. The environment-control effects of in winter and spring: the comparison of environmental parameters of four laying houses with different scales and different ventilationmodels in winter indicates that: the environment-control effects of the houses with40,000and160,000hens are relatively better, followed by the house with110,000hens, and that of thehouse with120,000hens is the worst (P <0.01).3. The comparison of optimized ventilation model: measurements of changes of theenvironment parameters of the120,000scale laying house under transverse, longitudinaland mixing ventilation in winter and spring show that the environment-control effects withinthe house under longitudinal ventilation is better (P<0.05).4. The relationship between environment parameters of laying houses and economictraits of laying hens: measurements of changes of economic traits of laying hens underdifferent aquaculture scales and ventilation models indicate that the economic effects of thesingle house with110,000hens is the best, followed by the house with40,000scale, and thatof the single house with120,000scale is the worst(P<0.01). Related analysis show that thereare not parameters (P>0.05) but the dust concentration of the laying houses is significantlyrelated to the economic traits of laying hens(P<0.05).Conclusion:1. The temperature of super-large scale laying houses can maintain within a suitablescope, even if they are under a obvious difference between inside and outside of the houses inwinter, yet the concentration of harmful gas is high. Dust concentration has obvious negativeeffects on the economic traits of laying hens, and the concentration of other harmful gas is nothigh enough to affect the economic traits.2. In spring, the environment condition of super-large scale laying houses is better thanin winter, but the lower concentration of harmful gas has few effects on the economic traits oflaying hens, and the dust concentration has a negative effects on the economic traits.3. Through the comparison of longitudinal, transverse and mixing ventilation of thesingle laying house with120,000hens in winter, we have found that environment parametersof the laying house under longitudinal ventilation is better than those of houses undertransverse and mixing ventilation. |
