| This experiment monitored environment quality of a building of half-open hens’shed in Xin Ji City Ma Zhuang village breeding base by Xin Lv Company, which was toresearch environment quality of monitoring and analysis in semi-open sheds and theeffect on hens’ production performance.This shed is3m high from ground to beam. Netspan and the length is8m and28m meters inside of henhouse respectively. There is aherringbone-color steel plate in the henhouse and its hens stock is2490., Conduct along-term dynamic Monitoring of the temperature, humidity, wind speed, light, carbondioxide concentration and ammonia concentration, ect. The indicators are from thelongitudinal (inlet, middle, outlet) and the vertical direction (upper, middle, lower incages) in the coop by using environmental detector. What’s more, the trial alsodetermined indicators of feed intake, laying rate, egg weight, et al. The result showedthat:1. Spring, temperature difference inside and outside of henhouse is2.4℃andhumidity difference is4.5%. The outlet temperature is higher than the temperature of themiddle position by0.3℃in the shed. it is higher than the temperature of the air inletposition by1.4℃. The average temperature of the upper cages is higher than the theaverage temperature of the lower cages by2.3°C. the average temperature of the middlecages is higher than the lower cages by1.2℃; The humidity in the middle position is46.4%, respectively, higher than the air inlet and outlet by3.2%and2.5%. the humidityin the lower cages is46.2%, respectively, higher than the middle and upper cages by5.1%and9.3%; The concentration of carbon dioxide of the air inlet is1483mg/m3,respectively, lower than the middle and outlet by40mg/m3and86mg/m3; Theillumination of the middle is up to40lx, respectively, higher than the air inlet and outletby22lx and15lx; The air outlet of the shed is almost in windless condition, the averagewind speed of the air inlet is0.03m/s, the average wind speed of the middle is0.04m/s;The average concentration of ammonia is4.3mg/m3in the shed; The temperature andhumidity is in a quadratic regression relationship (P <0.01, R2=0.918) and fit the equation:y=-22.338+9.337x-0.297x2.The average feed consumption of the middle is less thanaverage consumption of the inlet and outlet, the difference is significant(P <0.05).The feed consumption of the upper is lower than the feed intake of the middle and lowersignificantly(P <0.01).The average weight of the eggs of the lower is higher than theaverage weight of the upper and the middle significantly（P﹤0.05）.2. Summer, temperature difference inside and outside of henhouse is1.9℃andhumidity difference is6.5%. The temperature of air inlet, middle, outlet three positionsare up more than30℃, among the temperature of coop inlet is up to31.5℃，thetemperature of upper and middle cages are up more then30℃, is higher than lowercages; The humidity of air inlet is46.4%, respectively, lower than the air middle andoutlet by4.6%and6.3%. the humidity of the lower cages is78.6%, respectively, higherthan the middle and upper cages by11.9%and20.7%; The concentration of carbondioxide of the air inlet is relatively low as1393mg/m3, respectively, lower than themiddle and outlet by165mg/m3and42mg/m3; The illumination of the middle and outletare up more than40lx, the air inlet is only13lx; The wind speed of air inlet and middleare higher than outlet, both up more than0.1m/s; The average concentration of ammoniais relatively low as3mg/m3in the shed; The temperature and humidity is in a quadraticregression relationship (P <0.01, R2=0.876) and fit the equation:y=-417.270+35.796x-0.656x2. The temperature and concentration of wind speed is in aquadratic regression relationship (P <0.01, R2=0.881) and fit the equation:y=-3.999+0.255x-0.004x2. The Feed intake of the middle is lower than the feed intake ofthe air inlet and outlet significantly (P <0.05). The laying rate of air outlet is higher thanthe laying rate of air inlet and middle significantly (P <0.05).3. Autumn, temperature difference inside and outside of henhouse is2℃andhumidity difference is1.3%. The average temperature of air inlet is19.8℃, respectively,higher than the air middle and outlet by0.4%and0.1%. the temperature of upper cages is19.2℃, respectively, higher than middle and lower by1.2℃and2.9℃; the humidity ofthe air outlet is54.5%, respectively, higher than air middle and outlet4.4%and3.3%,the humidity of lower cages is50.5%,higher than middle and upper by9%and18.7%;The concentration of carbon dioxide of the air inlet is relatively low as1504mg/m3,respectively, lower than the middle and outlet by266mg/m3and534mg/m3;The averageillumination of middle is22lx, respectively, higher than air inlet and outlet by8.3lx and3.6lx; The wind speed of middle is0.07m/s, the wind speed of air inlet is0.05m/s, theaverage wind speed of air outlet is only0.01m/s; The average concentration of ammoniais3.6mg/m3in the shed; The temperature and humidity is in a quadratic regressionrelationship (P <0.01, R2=0.903) and fit the equation: y=-90.756+17.742x-0.530x2.Thetemperature and concentration of carbon dioxide is in a quadratic regression relationship(P <0.01, R2=0.824) and fit the equation: y=2584.503-46.003x+0.202x2.The Feed intakeof air outlet is higher than the feed intake of the air inlet significantly(P <0.05),is higherthan the feed intake of the middle significantly(P<0.01),the egg weight of air inlet is higher than the egg weight of the middle significantly(P <0.05),the laying rate of themiddle is lower than the laying rate of air outlet significantly(P <0.05).4. Winter，temperature difference inside and outside of henhouse is12.6℃andhumidity difference is5.4%. The average temperature of middle is12.5℃,,respectively,higher than air inlet and outlet by1.6℃and1.5℃,the average temperature of uppercages is higher than the average temperature of lower cages by4.5℃,is higher than theaverage temperature of middle cages by1.9℃;The humidity of middle is52.7%,respectively, higher than air inlet and outlet by13.6%and9.2%,the humidity of themiddle cages is47.2%, respectively, higher than upper and lower by0.6%and1.6%;The concentration of carbon dioxide is higher in winter, the concentration of carbondioxide of air inlet is2764mg/m3, The concentration of carbon dioxide of middle is2811mg/m3,The concentration of carbon dioxide of air outlet is2901mg/m3;The averageillumination of middle is58.3lx, respectively, higher than air inlet and outlet by31.9lxand35.6lx; The wind speed of air inlet, middle and outlet are all below0.02m/s. Thefeed intake and egg weight of lower cages is higher than the feed intake and egg weightof upper and middle cages significantly (P <0.05).5. Due to different seasons the environment of Semi-open sheds of the coop in thelongitudinal and vertical directions there are some differences in the productionperformance of the flocks,and the uniformity of the chicken shed is unsatisfactory.Conderring the overall environment parameters of the semi-open sheds of the coop.Inwinter the lowest average temperature at the shed can maintaine above8℃, theconcentration of ammonia is relatively high, but within the predetermined range, it ispossible to ensure the production performance of the chicken flocks will not beaffected.In summer the average temperature at the shed is respectively high. there is nogood cooling measures to reduce the heat stress of the flocks, so the productionperformance of the flocks decreased in summer.While in spring and in autumn,thehumidity in the coop is respectively low, other environmental factors are within therange,suitable for the laying hens for production.And the production performance of theflocks would not be affected. |
PDF Full Text Request