Partly slatted pens can offer growing/finishing pigs a better house environment than pens with fully slatted floors. Under thermoneutral conditions, pigs prefer to rest on a solid area and some litter can be provided as enrichment. Ammonia emissions are lower in systems with partly slatted pens, provided the pens are kept clean. However, under high-temperature conditions, pigs in partly slatted pens may begin lying on the slatted area and fouling on the solid floor area, resulting in increased ammonia emissions. This study examined the effects of increasing the air velocity (IAV) in the lying area from max 0.5 m s⁻¹ to max 1.0 m s⁻¹ on conditions for pigs in partly slatted pens during warm periods. Air velocity was increased by redirecting the inlet air from the ceiling inlets down into the animal zone.

The study was performed in a commercial growing/finishing house with 10 identical rooms, each containing 16 pens for 9-14 pigs growing from 25-30 kg to 115-120 kg live weight. Pigs were introduced simultaneously into two parallel rooms, one with IAV in the lying area and one without (control treatment). During two summers with six batches, concentrations of carbon dioxide (CO₂) and ammonia (NH₃), pig activity and choice of lying area in the pen, pen fouling and NH₃ emissions were recorded in both rooms on four measuring occasions (M1-M4) during the growing period. Gas concentrations were measured by photoacoustic analyser, pig activity and pig choice of lying area by machine vision techniques, and pen fouling by visual inspection. Climate parameters (air temperature, relative humidity) were logged continuously during the growing period. Ammonia emissions were calculated from the ventilation rate (determined by the indirect CO₂ tracer gas method) and the difference in ammonia concentration between outlet and inlet air.

Under high ambient temperatures, pigs in the IAV treatment were observed lying significantly more often (p<0.05) in the part of the lying area with the highest air velocity. Pigs tended to lie less in the slatted area (p=0.052) in the IAV treatment than in the control. Problems with pen fouling were significantly reduced with increased air velocity in the lying area and NH₃ emissions were reduced by 21% (p=0.009), from 8.4 to 6.6 g pig⁻¹ day⁻¹, during the late growing period (M4).

In conclusion, increasing air velocity in the lying area of partly slatted pens from max 0.5 to max 1.0 m s⁻¹ influenced pigs´ choice of lying area, improved pen hygiene and reduced ammonia emissions.

部分板条猪舍可以为生长/育肥猪提供比全板条地板更好的猪舍环境。在热中性条件下，猪更喜欢在坚固的区域休息，可以提供一些垫料作为补充。如果钢笔保持清洁，那么在带有部分条板条的钢笔系统中氨排放量较低。然而，在高温条件下，部分板条猪舍中的猪可能开始躺在板条区域并在固体地板区域结垢，导致氨排放增加。该研究检查了将躺卧区域的空气速度 (IAV) 从最大 0.5 ms ^-1增加到最大 1.0 ms ^{-1 的影响}关于温暖时期部分条板栏内猪的条件。通过将入口空气从天花板入口向下重新引导到动物区来增加空气速度。

该研究是在一个有 10 个相同房间的商业生长/育肥舍中进行的，每个房间包含 16 个猪圈，用于 9-14 头体重从 25-30 公斤到 115-120 公斤的猪。猪被同时引入两个平行房间，一个在躺卧区有 IAV，另一个没有（对照治疗）。在两个夏季的六个批次中，二氧化碳 (CO ₂ ) 和氨气 (NH ₃ ) 的浓度、猪的活动和围栏中躺卧区域的选择、围栏污垢和 NH ₃在生长期间的四个测量场合（M1-M4）记录了两个房间的排放量。通过光声分析仪测量气体浓度，通过机器视觉技术测量猪的活动和猪选择的躺卧区域，并通过目视检查猪圈污染。在生长期连续记录气候参数（气温、相对湿度）。根据通风率（通过间接 CO ₂示踪气体方法确定）和出口和入口空气之间的氨浓度差异计算氨排放。

在高环境温度下，观察到 IAV 处理中的猪明显更频繁地（p < 0.05）躺在空气流速最高的躺卧区域。与对照组相比，IAV 处理中的猪在板条区域（p = 0.052）中的位置往往更少。在生长后期 (M4) 期间，随着躺卧区空气流速的增加，猪栏污染问题显着减少，NH ₃排放量从 8.4 克减少到 6.6 克^-1天^-1 21% (p=0.009 ) .

总而言之，将部分条板栏的躺卧区域的空气速度从最大 0.5 增加到最大 1.0 ms ^{-1 会}影响猪对躺卧区域的选择，改善围栏卫生并减少氨排放。