27 years of livestock production data under different stocking rate levels at the Central Grasslands Research Extension Center near Streeter, North Dakota

The effects of stocking rate on livestock performance and profitability were monitored on 12 pastures at the Central Grasslands Research Extension Center (CGREC) near Streeter, ND from 1989 through 2015. These data were produced from an investigation of how the impacts of grazing intensity on native range, in addition to an economic component, was included to determine grazing intensity effect on animal production. Cattle were raised at the CGREC or purchased at auction. Livestock cattle breeds are unknown, but can be described as either yearling open heifer, bred heifers or all steers. 1994 was the only year when the herds were mixed sexes. A table of stocking history is available with this data package as a supplemental dataset called: StockingHistory1989-2015.csv. Information on pasture acreage and the proportion of acres in various ecological range sites, as well as stocking rates, are included as supplemental datasets and are called, respectively: Pasture_and_RangeSites.csv and Revised_AUM_Cals.csv
This data package supports papers reporting the response of livestock performance as ADG (average daily weight gain) and production as weight gain per unit land area to cattle grazing on northern mixed-grass prairie in south-central North Dakota that was subsequently invaded by Kentucky bluegrass (Poa pratensis L.) in 1995. Grazing traditionally occurred mid-May until mid-October in 12 pastures, each approximately 30 acres. The goal of managing grazing intensity was to leave a certain percentage of forage produced in that year OR relative to an average year on the pasture. This was achieved by adjusting stocking rate (i.e. number of individuals per area) within each pasture. When necessary as in 2015, animals were supplemented with dried distiller’s grain at .3% of body weight each day. An animal unit month was used to determine stocking rates and is defined as the forage required to sustain a 1,000 lb cow and her calf for one month. This assumes they require 26 lbs/day of forage on a dry matter basis. This forage amount was based on metabolic weight of animals in this study, including a 1200lb cow as 1.147 AUMs and a 700 lb steer or open heifer as.765 AUM. Five grazing intensities included: no grazing, light grazing (1.3 animal unit months [AUM] · ha-1 with 65% of forage left in the fall), moderate grazing (2.7 AUM · ha-1 with 50% of forage left in the fall), heavy grazing (4.4 AUM · ha-1 with 35% of forage left in fall), and extreme grazing (6.9 AUM · ha-1 with 20% of forage left in the fall).
Resources in this dataset:Resource Title: Descriptions of pasture and rangelands sites. File Name: Pasture_and_RangeSites.csvResource Description: These data are supplemental to livestock production and provide descriptions of pasture and rangeland ecological sites on which cattle grazed.Resource Title: Data dictionary for descriptions of pasture and rangelands sites. File Name: Pasture_and_RangeSites_DataDict.csvResource Description: Column header definitions for descriptions of pasture and rangelands sitesResource Title: Stocking history (1989-2015) for pastures at the Central Grasslands Research Extension Center near Streeter, North Dakota . File Name: StockingHistory1989-2015.csvResource Description: These are supplemental data to describe stocking history (1989-2015) for pastures at the Central Grasslands Research Extension Center near Streeter, North Dakota Resource Title: Data dictionary for the stocking history (1989-2015) for pastures at the Central Grasslands Research Extension Center near Streeter, North Dakota . File Name: StockingHistory1989-2015_DataDict.csvResource Description: Column headers defined for the stocking history (1989-2015) for pastures at the Central Grasslands Research Extension Center near Streeter, North Dakota Resource Title: Stocking rates (1989-2015) for pastures at the Central Grasslands Research Extension Center near Streeter, North Dakota . File Name: AUM_Calcs_AUMperAcre.csvResource Description: Stocking rates (1989-2015) for pastures at the Central Grasslands Research Extension Center near Streeter, North Dakota reported for each grazing treatment in acres required to provide forage, as well as a mean stocking rate calculated with AUM/acre and as the inverse of the number of acres provided.Resource Title: Data dictionary for stocking rates (1989-2015) for pastures at the Central Grasslands Research Extension Center near Streeter, North Dakota . File Name: AUM_Calcs_DataDict_AUMperAcre.csvResource Description: Column headers defined for stocking rates (1989-2015) for pastures at the Central Grasslands Research Extension Center near Streeter, North Dakota Resource Title: 27 years of livestock production data under different stocking rate levels at the Central Grasslands Research Extension Center near Streeter, North Dakota . File Name: Streeter-ND_1989-2015_compiled.csvResource Description: Compiled data for 27 years of livestock production data under different stocking rate levels at the Central Grasslands Research Extension Center near Streeter, North Dakota. Multiple data dictionaries are available to supplement these data, including descriptions of ecological sites, the stocking history, and stocking rates for each grazing treatment. Resource Title: Data dictionary for 27 years of livestock production data under different stocking rate levels at the Central Grasslands Research Extension Center near Streeter, North Dakota . File Name: Streeter-ND_1989-2015_compiled_DataDict.csvResource Description: Columns headers defined for compiled 27 years of livestock production data under different stocking rate levels at the Central Grasslands Research Extension Center near Streeter, North Dakota

自1989年至2015年，在北达科他州斯特里特附近的中央草原研究推广中心（CGREC）的12个放牧场，对放牧密度对牲畜性能和经济效益的影响进行了监测。这些数据来源于对放牧强度对原生草场影响的研究，并纳入经济因素，以确定放牧强度对动物生产的影响。牲畜在CGREC饲养或从拍卖中购得。牲畜的品种不详，但可描述为周岁未配种母牛、已配种母牛或所有公牛。1994年是唯一一年，牧群混合了雌雄性别。与该数据包一起提供的补充数据集为放牧历史表，名为：StockingHistory1989-2015.csv。包括牧场面积和不同生态草场类型的面积比例，以及放牧密度等信息，作为补充数据集，分别命名为：Pasture_and_RangeSites.csv和Revised_AUM_Cals.csv。本数据包支持报道牲畜性能对平均日增重（ADG）和单位土地面积产量的响应，这些牲畜在南达科他州西南部的北部混合草地放牧，该草地于1995年被肯塔基蓝草（Poa pratensis L.）入侵。放牧通常在五月中旬至十月中旬进行，12个放牧场均约30英亩。管理放牧强度的目标是保留当年产生的部分牧草或相对于牧场的平均年份。这通过调整每个牧场的放牧密度（即每单位面积的人数）来实现。在必要时，如2015年，动物每天补充0.3%的体重干酒精蒸馏物。使用动物单位月来确定放牧密度，其定义为维持1,000磅母牛及其犊牛一个月所需的牧草。这假定它们需要每天26磅的干物质基础牧草。这种牧草量基于本研究中动物的新陈代谢体重，包括1,200磅的母牛作为1.147 AUMs，以及700磅的公牛或未配种母牛作为0.765 AUM。包括五种放牧强度：不放牧、轻度放牧（1.3动物单位月[AUM]·ha^-1，秋季保留65%的牧草）、中度放牧（2.7 AUM·ha^-1，秋季保留50%的牧草）、重度放牧（4.4 AUM·ha^-1，秋季保留35%的牧草）和极端放牧（6.9 AUM·ha^-1，秋季保留20%的牧草）。