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Abstract：
The National Beef Quality Audit - 2022 serves as a benchmark of the current fed steer and heifer population of the U.S. beef industry and allows comparison to previous audits as a method of monitoring industry progress. In-plant cooler assessments and collections of beef carcass data took place from July 2021 to November 2022. During in-plant evaluations, 10% of 1-d production was surveyed for quality and yield indicating characteristics of fed beef carcasses (n = 9,746 beef carcasses). Distributions of sex classes among sampled carcasses were steer (65.0%) and heifer (35.0%), whereas distributions of breed type were native (87.7%), dairy (11.3%), and Bos indicus (0.9%). Mean values were observed for USDA Yield Grades (YG; 3.3), USDA Quality Grade (QG; Choice16), marbling score (Small98), ribeye area (91.0 cm2), adjusted fat thickness (1.49 cm), hot carcass weight (401.9 kg), and KPH (2.5%). Mean overall maturity was A66, with a mean lean maturity of A56 and mean skeletal maturity of A72. There were 28.1% of carcasses identified for use in a USDA-certified beef G-Schedule Program. Defects, such as dark cutting and blood splash, were observed at 1.8% and 0.5%, respectively. Distributions of USDA YG were YG 1 (8.2%), YG 2 (30.7%), YG 3 (40.2%), YG 4 (16.6%), and YG 5 (4.3%). USDA QGs were observed at 7.5% Prime, 69.2% Choice, 16.4% Select, and 6.8% other. The results of this study provide an updated look at the current grading trends of beef carcasses in the United States to drive progress in the fed beef industry.
摘要：
国家牛肉质量审计-2022年是美国牛肉行业当前联邦牛和小母牛人口的基准，并允许与以前的审计进行比较，作为监测行业进展的一种方法。工厂内冷却器评估和牛肉car体数据收集于2021年7月至2022年11月进行。在工厂内评估期间，对1-d产量的10％进行了质量和产量调查，表明了饲喂牛肉car体的特征（n=9,746牛肉car体）。样本尸体中的性别类别分布分别为牛（65.0％）和小母牛（35.0％），而品种类型的分布是本地的(87.7%)，乳制品（11.3%），和Bosindicus(0.9%)。观察到美国农业部产量等级的平均值（YG；3.3），美国农业部质量等级(QG；Choice16)，大理石花纹得分(Small98),ribeye面积(91.0cm2),调整脂肪厚度（1.49厘米），热car体重量（401.9公斤），和KPH（2.5%）。平均总体成熟度为A66，平均瘦肉成熟度为A56，平均骨骼成熟度为A72。确定有28.1%的屠体用于美国农业部认证的牛肉G-计划。缺陷,比如黑暗切割和血液飞溅，分别为1.8%和0.5%，分别。美国农业部YG的分布为YG1（8.2%），YG2（30.7%），YG3（40.2%），YG4（16.6%），和YG5（4.3%）。美国农业部的QGs在7.5%的Prime时观察到，69.2%的选择，16.4%选择，和其他6.8%。这项研究的结果提供了对美国牛肉屠体当前分级趋势的最新了解，以推动饲料牛肉行业的进步。
