Mrthodlogical Research On Environmental Control Of Ultra Large Scale Automated Laying Hen Houses

The research of critical control points in operation specification about ultra-large-scale automated laying hens breed aquatics, We have known the relationship between environmental parameters changes in seasonal environmental control mode and laying hens production performance,and the Laying performance is influenced by stocking density and light,and all the experiments were done in chicken farms of shannxi dajiang which a singal chicken house with8layers of stacked automatic machines could breed12million chickens.We determined the concentrations of CO2、O2and NH3and temperature, and the levels of wind speed and total dust concentration, as well as chickens economic traits indicators in seasonal environmental control mode, the results showed that:1.The features of change of environmental parameters in maximum ventilation mode of chicken farms in summer:the concentrations of CO2、O2and NH3, wind speed and temperature are gradually decreased along with the distance gradually increased for longitudinal fans, at the first point that is nearest from fans achieves a minimum,they are206±52ppm、0.4±0.1ppm、0.50±0.09m/s�'�19.0±0.6℃; the concentration of O2is relatively stable. The negative correlation between the concentration of CO2and O2is not obvious (P>0.05), but the relationship with temperature, wind speed and the concentration of O2are strong positive correlation (P<0.05). The negative correlation between the concentration of O2and other environmental parameters is not obvious (P>0.05).The relationship between temperature and wind speed is significantly positive correlation (P＜0.01), and the relationship between wind speed and concentration of NH3is also obvious(P<0.05). Coop various environmental parameters correlation results suggest summer maximum ventilation mode only measured CO2concentration and temperature whether it is appropriate to estimate changes in other environmental parameters and to assess the quality of the environment coop. The CO2concentration and vertical wind turbines, with the increase of the distance gradually reduced, taking into account the convenience of measuring CO2concentration, measured in the production practice only fan the nearest point from the vertical CO2concentration and temperature, which can complete the henhouse summer environment monitored. 2. Autumn sheds environmental control optimization modes:three modes by Autumn (2.3longitudinal ventilation mode,1.8and1.5Mixed longitudinal ventilation mode ventilation mode) Measurement and analysis of environmental parameters, three kinds of ventilation modes under sheds NH3concentration, O2concentration, temperature and breathing dust there was no significant difference (P>0.05), but the three caught up by1.5mixing ventilation mode, followed by1.8and2.3vertical longitudinal ventilation mode ventilation mode; different ventilation modes significantly affect CO2sheds concentration (P <0.05), discounted at1.5mixed mode ventilation highest CO2concentration (1084±124ppm),1.8second longitudinal ventilation mode (744±235ppm),2.3minimum longitudinal ventilation mode (503±255ppm). Three different ventilation modes under various environmental quality indicators are discounted to ensure normal growth conditions required chicken. But with2.3sheds longitudinal ventilation mode can get a better environment to maintain and improve.3. Winter house environmental control optimization mode:Through three modes (0.9mixed ventilation mode,0.5lateral ventilation mode,0.7mixing ventilation mode) Measurement and analysis of environmental parameters, three kinds of ventilation mode coop O2concentration, NH3concentration, temperature and CO2concentration had no significant effect (P>0.05); coop concentration of NH3and CO2concentrations are0.5maximum transverse ventilation mode, followed by0.7and0.9mixing ventilation mode hybrid ventilation mode; different ventilation modes significantly affect respirable dust concentration (P<0.05), of which0.5transverse ventilation mode highest (2.53±0.15mg/m3), significantly higher than the0.7and0.9mixing ventilation mode hybrid ventilation mode, followed by0.7mixing ventilation mode (2.15±0.11mg/m3), significantly higher than0.9hybrid ventilation mode (1.92±0.09mg/m3). Chenet environment0.9Mixed mode to achieve better ventilation to maintain and improve.4. Spring house environmental control optimization mode:Through two modes (0.8mixing ventilation mode,1.2mixing ventilation mode) Measurement and analysis of environmental parameters, two kinds of ventilation mode coop O2concentration, NH3concentration, temperature and CO2concentration had no significant effect (P>0.05); coop temperature, CO2concentration and NH3concentrations are0.8hybrid ventilation mode Highest; different ventilation modes significantly affect respirable dust concentrations (P <0.05), of which0.8hybrid ventilation mode (2.28mg/m3±0.09) was significantly higher than1.2hybrid ventilation mode (1.49mg/m3±0.08). Discounted at1.2hybrid ventilation mode environment can be better maintained and improved.5. Small groups of rearing density on laying rate effects:experimental design with four breeding density, respectively,7/cage bit,8/cage bit,9/cage-bit and10/cage bit4treatment. In coop third longitudinal Road on both sides of the second layer as a test alternative cages cages, select the pedestrian corridor for light source just below the four cage bit is a test cell (two on each side of the longitudinal channel is connected the two cages bit; each cage length0.60m, width0.57m), at intervals of5m select a test area, a total of20experimental plots. Each experimental plot of the four cages bit random layout for the design of four breeding density, each cell is similar to41repeat of five repeat,80cages. Determination try chicken egg production rate of6months. Results egg production rate of each experimental group were significantly different (P<0.05), with7/cage egg production test group bit rate of up to84.55%, with the stocking density increases, egg production rates were significantly decreased.6. Light intensity on laying performance:Test uniform sampling method, that sheds light just below the second longitudinal channel on one side of a vertical direction to a cage for each four-bit (count4cage bits) is an experimental plots every5m (2lamp distance) select a test area, were selected20experimental plots, totaling80experimental cages bit. Experimental determination within six months of the chicken egg weight and egg production. Cages measured80bit house the practical light intensity difference (0.91x～29.11x), divided into6treatment groups (5lux per one processing interval) to1bit per cage repeat. Results With the light intensity increases, the overall egg production rate at first increased and then decreased curve, in which the light intensity was16.9lx laying rate highest test group (79.37±6.09%), significantly higher than the light intensity of23.2lx test group (P<0.05), significantly higher than the light intensity of27.1lx test group (P<0.01), with the other groups was not significant (P>0.05); with the light intensity increases, the average egg weight generally showed similar linear increase in the variation, in which the light intensity was27.1lx experimental group, the average egg weight max.Conclusion:1. Summer maximum ventilation mode can be sheds CO2and NH3concentrations were reduced to a minimum value of206±52ppm,0.4±0.1ppm. Measuring distance from the longitudinal fan in summer nearest point of carbon dioxide concentration and temperature, which can complete the monitoring of the environment of the house. Autumn optimal ventilation mode ventilation coefficient of2.3m3/h/kg longitudinal ventilation mode; winter hybrid ventilation mode ventilation coefficient of0.9m3/h/kg transverse ventilation mode In Spring the hen house recommend adopt the coefficient of ventilation is1.2m3/h/kg hybrid ventilates the pattern.2. In the ultra-large-scale feeding mode,7/bird cage bit is the most appropriate stocking density, Suitable bird breeding area is488cm2.3. In large scale feeding mode, the optimum light intensity of laying hens is16.9lx, the optimal illumination range is7.5to16.9lx.