Parameters distribution and performance difference of high quality broilers under different environmental controls
[Objective]The present study aimed to clarify the internal correlation between environmental parameters change and production performance of high quality chicken houses under different feeding conditions,and provide theoretical basis for the control of environmental parameters in high quality chicken houses.[Method]A total of 480 healthy 0-day high quality broiler chickens of L line were divided into four groups with 120 chickens per group randomly,6 replicates and 20 chickens each replicate.Experimental groups Ⅰ,Ⅱ and Ⅲ were fed in three closed environmental control modules,and control group Ⅳ was fed in temperature controlled chambers during brooding period(0-21 days),and transferred to semi-enclosed common coop later.The internal environmental parameters,the changes of body weight,body size and the development of sexual organs were measured.[Result](ⅰ)The temperature of group Ⅳ chickens in the environmental control chamber was relatively high,reaching more than 32 ℃,and the humidity was about 55％.The concentrations of NH3,PM2.5 and PM10 were always in a low state.With the gradual increase of the temperature and humidity difference between the chicken house and the outside after the transfer to the semi-enclosed ordinary chicken house,the change laws of the concentration of gases and dust were the same as outside the house basi-cally,which decreased first and then rose,and the concentration of O2 was always in a relatively stable trend.The exchange of fresh air in groups Ⅰ,Ⅱ and Ⅲ kept the temperature and humidity within the preset range,other NH3,CO2,O2,PM2.5,PM10 and other environmental pa-rameters change trends were consistent with the house basically,lower than the ordinary semi-enclosed chicken coop slightly.(ⅱ)The corre-lations between the temperature outside the house and O2,CO2 and NH3 were 0.7287,-0.7123 and-0.6875(P＜0.01),and the correla-tions between the temperature inside the house and O2,CO2 and NH3 were 0.8071,-8427 and-0.7221 respectively(P＜0.01).All of them were correlated or strongly correlated moderately,indicating that temperature had a greater influence on gas concentration,and the tem-perature inside the house had a stronger correlation with gas concentration than outside the house.(ⅲ)At 8 weeks of age,the body weight of group Ⅱ was significantly higher than groups Ⅲ and Ⅳ(P＜0.05,the same as below),the body growth and development of chickens in all groups reached the peak at 12 weeks of age,the body weight of group Ⅱ were about 84 g,144 g and 126 g higher than group Ⅰ,Ⅲ and Ⅳ re-spectively,and body diagonal length and keel length in group Ⅱ were significantly higher than groups Ⅰ,Ⅲ and Ⅳ.At 16 weeks of age,the length of fallopian tube in group Ⅱ reached 23.25 mm,and the weight of yolk follicles and ovaries were 6.25 and 10.15 g respectively,which were significantly higher than groups Ⅰ,Ⅲ and Ⅳ.The results showed that there were significant differences in growth and sexual organ devel-opment of high quality broilers under different environmental parameters.[Conclusion]There are some differences in growth and sexual matu-rity among different coop environmental parameters,and the closed loop control mode is more suitable for the healthy growth and welfare breeding of high quality broiler chickens in China.High quality broilers have different requirements for temperature and humidity in different growth cycles,among which Group Ⅱ environmental control mode has more advantages in growth and sexual organ development at different age segments,so it is recommended to increase its application in poultry breeding.
High quality broilerClosed environmental control moduleSemi-enclosed common chicken coopEnvironmental parametersGrowth and development
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