Data from USDA ARS Central Plains Experimental Range (CPER) near Nunn, CO: Cattle weight gains managed with light, moderate and heavy grazing intensities

The USDA-Agricultural Research Service Central Plains Experimental Range (CPER) is a Long-Term Agroecosystem Research (LTAR) network site located ~20 km northeast of Nunn, in north-central Colorado, USA. In 1939, scientists established the Long-term Grazing Intensity study (LTGI) with four replications of light, moderate, and heavy grazing. Each replication had three 129.5 ha pastures with the grazing intensity treatment randomly assigned. Today, one replication remains. Light grazing occurs in pasture 23W (9.3 Animal Unit Days (AUD)/ha, targeted for 20% utilization of peak growing-season biomass), moderate grazing in pasture 15E (12.5 AUD/ha, 40% utilization), and heavy grazing in pasture 23E (18.6 AUD/ha, 60% utilization). British- and continental-breed yearling cattle graze the pastures season-long from mid-May to October except when forage limitations shorten the grazing season. Individual raw data on cattle entry and exit weights, as well as weights every 28-days during the grazing season are available from 2000 to 2019. Cattle entry and exit weights are included in this dataset. Weight outliers (± 2 SD) are flagged for calculating summary statistics or performing statistical analysis.

美国农业部农业研究服务局（USDA-ARS）中央平原实验牧场（CPER）是长期农业生态系统研究（LTAR）网络站点，位于美国科罗拉多州中北部Nunn市东北约20公里处。1939年，科学家们建立了长期放牧强度研究（LTGI），设置了轻度、中度和重度放牧三种处理，每种处理重复四次。每个重复组包含三个129.5公顷的牧场，放牧强度处理随机分配。如今仅存一个重复组。轻度放牧在23W牧场进行（9.3动物单位日（AUD）/公顷，目标是生长季高峰期生物量利用率20%），中度放牧在15E牧场（12.5 AUD/公顷，利用率40%），重度放牧在23E牧场（18.6 AUD/公顷，利用率60%）。英国和欧洲大陆品种的一岁牛从5月中旬到10月进行全季放牧，除非牧草限制导致放牧季缩短。2000年至2019年期间的牛只进出栏体重原始数据，以及放牧季每28天的体重数据均可获取。本数据集包含牛只的进出栏体重数据。体重异常值（±2标准差）已被标记，用于计算汇总统计量或进行统计分析。