Neiker-Tecnalia, Conservation of Natural Resources, Bizkaia Technology Park, P. 812, 48160 Derio, Bizkaia, Spain.
Institute of Animal Science and Technology, Unviersitat Politécnica de Valencia, 46022 Valencia, Spain.
Poult Sci. 2019 Mar 1;98(3):1211-1221. doi: 10.3382/ps/pey524.
Gaseous emission in laying hen facilities affects animal production performance and the environment. Emission is ruled by gas concentration and ventilation rate (VR), which are the key parameters to estimate precise emission factors. In this work, VR were assessed in a mechanical ventilated laying hen facility under Mediterranean climate conditions. The study was performed during a complete production cycle from July 2015 to October 2016. Direct hot wire anemometer (HWA) and fan rotational speed methods, and indirect CO2 mass balance method were used to assess the VR. Mean VR was 5.3 ± 2.9 m3 h-1 hen-1 for the HWA method. The mean uncertainty of VR based on the HWA method was 8.5%, and it varied among ventilation stages from 2.3 to 12.8%. Uncertainty was higher in warm season (9.6%) than in cold season (5.4%). In relation to fan rotational speed method, mean VR was 5.9 ± 3.3 m3 h-1 hen-1, which accounts for 8.3% more than the HWA method. According to the results, the fan rotational speed method would be less sensitive than the HWA method for assessing VR. VR was 6.3 ± 2.1 m3 h-1 hen-1 for the CO2 balance method, which estimated lower VR values in warm season compared to the laser tachometer (LT) method (-5%) but higher values compared to the HWA method (+5%). In contrast, it estimated higher values in cold season compared to the HWA method (+23%) and LT method (+17%). Correlation analysis showed a strong correlation between the CO2 balance method and both direct methods (R = 0.85 and 0.86 for HWA and LT, respectively).
在蛋鸡设施中，气体排放会影响动物生产性能和环境。排放受气体浓度和通风率（VR）的控制，VR 是估计精确排放因子的关键参数。在这项工作中，评估了在具有地中海气候条件下的机械通风蛋鸡设施中的 VR。该研究在 2015 年 7 月至 2016 年 10 月的整个生产周期内进行。使用直接热线风速仪（HWA）和风扇转速方法以及间接 CO2 质量平衡方法来评估 VR。HWA 方法的平均 VR 为 5.3 ± 2.9 m3 h-1 只鸡-1。基于 HWA 方法的 VR 平均不确定度为 8.5%，并且在通风阶段之间变化，范围为 2.3%至 12.8%。在温暖季节（9.6%）的不确定性高于寒冷季节（5.4%）。与风扇转速方法相比，平均 VR 为 5.9 ± 3.3 m3 h-1 只鸡-1，比 HWA 方法高 8.3%。根据结果，与 HWA 方法相比，风扇转速方法对 VR 的评估可能不太敏感。CO2 平衡方法的 VR 为 6.3 ± 2.1 m3 h-1 只鸡-1，与激光转速计（LT）方法相比（-5%），温暖季节的 VR 值估计较低，但与 HWA 方法相比（+5%）的 VR 值较高。相比之下，与 HWA 方法（+23%）和 LT 方法（+17%）相比，寒冷季节的 VR 值较高。相关性分析表明，CO2 平衡方法与两种直接方法之间存在很强的相关性（与 HWA 和 LT 分别为 0.85 和 0.86）。
