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《China Poultry》 2019-17
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Patterns of Oviposition and Eggs Outside the Nest of Laying Hens in the Three-dimensional Free-range Welfare Henhouse during the Late Laying Period

LI Yan;ZHAN Kai;MA Ruiyu;ZHAO Tao;LI Junying;LIU Wei;WAN Yi;YAO Junfeng;YANG Changsuo;XU Hongfei;PANG Fangzhong;Anhui Key Laboratory of Livestock and Poultry Product Safety Engineering,Institute of Animal Husbandry and Veterinary Medicine,Anhui Academy of Agricultural Science;College of Animal Science and Technology,Anhui Agricultural University;Shanghai Academy of Agricultural Sciences;Jiangsu Hongxuan Ecological Agriculture Co.,Ltd.;  
This study aimed to investigate the patterns of oviposition and eggs outside the nest of laying hens in the three-dimensional free-range welfare henhouse during the late laying period.The number of eggs at seven different period and eggs outside the nest of 52-week-age Xinyang black laying hens were recorded daily.The ratio of egg production rate was calculated and fitted,and eggs outside the nest were statisticed.Results clearly demonstrated that the ratio of egg production rate increased gradually from 5∶00 to 11∶00 and reach a maximum at 11∶00,and decreasing afterward.Egg production was significantly higher in the morning than in the afternoon.Egg production per nest box was significantly higher in dark side of dark area than in sunlight side of dark area daily,specifically,egg production were higher in dark side of dark area than in sunlight side of dark area during 9∶00 to 11∶00,11∶00 to 13∶00,15∶00 to 17∶00 and 19∶00 to 21∶00.The fitting results illustrated that the distribution curve of the ratio of egg production rate was skewed and seems more consistent with polynomial function,yP=238.59756-579.11051 x+532.98715 x~2-234.87362 x~3+55.77107 x~4-7.33219 x~5+0.50265 x~6-0.01402 x~7,R~2=0.99872,x∈(1,9).Moreover,the results demonstrated a region-specific distributions in eggs outside the nest.The overall results suggested that the time of feeding management should be arranged reasonably,and feeding management and daily work strengthened according to the patterns of oviposition and eggs outside the nest of laying hens to improve the production efficiency and economic benefits.
【Fund】: 国家自然科学基金项目(31601932);; 现代农业产业技术体系建设专项资金(CARS-40-K21)
【CateGory Index】: S831
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