Assessment of Lighting Needs by Laying Hens via Preference Test
(0) This study was conducted to investigate hens needs for light intensity and circadian rhythm using a light tunnel with five identical compartments each at a different fluorescent light intensity of <t, 5, 15, 30 or 100 lux.The hens were able to move freely among the compartments.A group of four W-36 laying hens (23-30 weeks of age) was tested each time,and six groups or repetitions were conducted.Hen behaviors were continuously recorded, which yielded the data on time spent, feed intake, feeding time, and eggs laid at each light intensity and inter-compartment movement.The results show that the hens spent 6.4 h (45.4%) at 5 lux, 3.0 h(22.1%) at 15 lux, 3.1 h (22.2%) at 30 lux, and 1.5 h (10.3%) at 100 lux under light condition;and spent 10.0 h under dark (<1 lux).Daily feed intake was 87.3 g d-1 and distributed as 24.8 g hen-1 d-1 (28.4%) at <1 lux, 28.4 g hen-1 d-1 (32.5%) at 5 lux, 13.8 g hen-1 d-1 (15.8%) at 15 lux,14.5 g hen-1 d1 (16.6%) at 30 lux, and 5.8 g hen-1 d-1 (6.7%) at 100 lux, respectively.Hen-day egg production rate was 96.0%; and most of the eggs were laid at <1 lux (61.9% of total) which was significantly different from other light intensities (P < 0.05).The overall photoperiod was10 h darkness (<1 lux) and 14 h light or 14L∶ 10D, with a fairly constant hourly dark time of25.0 ± 0.4 min throughout the day.
Light intensity laying hens light preference behavior circadian rhythm
He Ma Hongwei Xin Yang Zhao Baoming Li Timothy A.Shepherd Ignacio Alvarez
Key Laboratory of the Ministry of Agriculture for Agricultural Engineering in Structure and Environm Department of Agricultural and Biosystems Engineering, Iowa State University,Ames, IA 50011-3310, US Key Laboratory of the Ministry of Agriculture for Agricultural Engineering in Structure and Environm Department of Statistics, Iowa State University, Ames, IA 50011-3310, USA
国际会议
The 2015 International Symposium on Animal Environment and Welfare(动物环境和福利国际研讨会)
重庆
英文
241-248
2015-10-23（万方平台首次上网日期，不代表论文的发表时间）