Feed efficiency is an important economic trait in beef cattle production, and improving feed efficiency can reduce production costs and environmental impact. Residual feed intake (RFI) is a useful measure of individual feed efficiency, representing the difference between the actual feed intake of an animal and its predicted feed intake based on its body weight (BW) and growth. This study aimed to investigate feed intake and analyze RFI in Hanwoo cattle to improve feed efficiency. Data were collected from 120 Hanwoo steers (9 to 11 mo old) from six different test stations across the country. Individual daily feed intake of concentrates and forage was recorded over 70 d, and BW was measured at the beginning and end of the feeding trial. Daily feed intake was calculated using the TDN values of the concentrates and forage. Expected feed intake was estimated using a linear regression model based on metabolic BW and daily gain. RFI was calculated as the difference between expected and actual feed intake. Average daily gain ranged from 1.05 to 1.71 kg/d, and average daily feed intake ranged from 5.10 to 7.72 kg/d across the test stations. RFI values ranged from -0.84 to 0.95 kg/d, indicating significant variation in feed efficiency among the animals. This study provides valuable information on feed intake and RFI in Hanwoo cattle. Further research with a larger dataset is needed to develop a genetic evaluation model for RFI and to select animals with superior feed efficiency for improving Hanwoo cattle production.

中文翻译：

---

PSVII-9 提高韩国韩牛饲料效率：采食量调查和残余采食量 （RFI） 分析


饲料效率是肉牛生产中的一个重要经济特性，提高饲料效率可以降低生产成本和对环境的影响。剩余采食量 （RFI） 是衡量个体饲料效率的有用指标，表示动物的实际采食量与根据其体重 （BW） 和生长情况预测的采食量之间的差异。本研究旨在调查韩牛的采食量并分析 RFI，以提高饲料效率。数据是从全国 6 个不同测试站的 120 头韩牛公牛（9 至 11 个月大）中收集的。记录精料和牧草的个体每日采食量超过 70 天，并在饲喂试验的开始和结束时测量 BW。使用精料和牧草的 TDN 值计算日采食量。使用基于代谢 BW 和日增重的线性回归模型估计预期采食量。RFI 计算为预期采食量和实际采食量之间的差值。各测试站的平均日增重为 1.05 至 1.71 kg/d，平均日采食量为 5.10 至 7.72 kg/d。RFI 值范围为 -0.84 至 0.95 kg/d，表明动物之间的饲料效率存在显著差异。本研究提供了有关韩牛采食量和 RFI 的宝贵信息。需要使用更大的数据集进行进一步研究，以开发 RFI 的遗传评估模型，并选择具有卓越饲料效率的动物来提高韩牛产量。