Universidade Federal de Viçosa, Departamento de Engenharia Agrícola, Av. Peter Henry Rolfs, s/n, Campus Universitário, 36570-900 Viçosa, MG, Brazil.
Universidade Federal de Lavras, Departamento de Engenharia, Av. Doutor Sylvio Menicucci, 1001, Aquenta Sol, 37200-000 Lavras, MG, Brazil.
An Acad Bras Cienc. 2021 May 31;93(3):e20200384. doi: 10.1590/0001-3765202120200384. eCollection 2021.
The aim of this research was to evaluate the spatial distribution of bedding variables in a climate-controlled compost bedded pack barn (CBP) equipped with an evaporative cooling system associated with a tunnel ventilation mode. The study was conducted on a farm in the West Mesoregion of Minas, MG, Brazil. The interior of the animal facility was divided into a mesh of 120 equidistant points, where the bedding surface temperature (tb-sur), the bedding temperature at 0.20 m depth (tb-20) and the bedding penetration resistance (PRb) of layer 0 to 0.20 m depth were measured. Bedding samples were collected to obtain the moisture (Mb) and pH in the surface and at 0.20 m depth. Geostatistics technique was used to evaluate the dependence and spatial distribution. Through the bedding area, the tb-sur presented low variability, with 6 ºC of amplitude, and tb-20 presented highest values (up to 55 °C). The spatial distribution of Mb-20 was similar to that observed on the surface and its highest levels occurred in the region near the feed alley (> 40%). The distribution of pH was similar in both layers. The tendency of high PRb occurred in the layer between 0.15 and 0.20 m (0 and 1500 kPa).
本研究旨在评估配备蒸发冷却系统的气候控制垫料卧床饲养（CBP）系统中卧床变量的空间分布，该系统与隧道通风模式相关。研究在巴西米纳斯吉拉斯州中西部地区的一个农场进行。动物设施内部被划分为 120 个等距点的网格，在这些点上测量垫料表面温度（tb-sur）、0.20 米深度处的垫料温度（tb-20）和 0 到 0.20 米深度处的垫料穿透阻力（PRb）。采集垫料样本以获得表面和 0.20 米深度处的水分（Mb）和 pH 值。采用地统计学技术评估依赖性和空间分布。通过垫料区域，tb-sur 的变异性较小，幅度为 6 ºC，tb-20 呈现出最高值（高达 55 °C）。Mb-20 的空间分布与表面观察到的相似，其最高水平出现在靠近饲料通道的区域（> 40%）。两个层面的 pH 值分布相似。PRb 较高的趋势出现在 0.15 到 0.20 米（0 到 1500 kPa）之间的层中。
