Summer season temperature-humidity index threshold for infrared thermography in Hanwoo (Bos taurus coreanae) heifers.

IF 2.2 2区农林科学

Asian-Australasian Journal of Animal Sciences Pub Date : 2020-10-01 Epub Date: 2020-01-13 DOI:10.5713/ajas.19.0762

Na Yeon Kim, Sang Ho Moon, Seong Jin Kim, Eun Kyung Kim, Mirae Oh, Yujiao Tang, Se Young Jang

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引用次数: 7

Abstract

Objective: The study sought to estimate the relationship between body surface temperature (BST) and temperature humidity index (THI) and to present the validity of THI as a heat stress index in the field.

Methods: Eight Hanwoo heifers (20 to 32 month) were examined in a field trial, with a space allowance of 10 m2 per head. The BST was measured using an infrared thermographic camera. The BST of five body regions (eyes, hindquarters, nose, part of horns, and ears), ambient temperature (AT), and relative humidity (RH) were measured 7 times daily (07, 09, 11, 13, 15, 17, and 19 h) during each season with three replicates.

Results: The THI ranged 34.0 to 56.9 during spring (AT, -1.0°C to 13.4°C), 75.1 to 84.7 during summer (AT, 24.9°C to 33.6°C), 55.8 to 70.9 during autumn (AT, 13.0°C to 26.0°C) and 17.5 to 39.2 during winter (AT, -10.4°C to 1.0°C). In the regression analysis, the coefficient of determination (R2) between THI and BST was 0.88, 0.72, 0.83, 0.86, and 0.85 for the eyes, hindquarters, nose, part of horn, and ears area, respectively. This indicates that BST has a strong correlation with AT and RH. Expression equations were estimated as Y (THI) = 31.54+0.1085X (BST of eyes) and Y (THI) = 30.48+0.1147X (BST of hindquarters) by simple linear regression analysis in this experiment.

Conclusion: Consequently, the upper bound for heat stress estimation can be specified ranging from THI of 65 (eyes) to 70 (hindquarters). From this we can expect a precise feeding system for Korean native cattle in the field.

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韩宇(Bos taurus coreanae)小母牛夏季红外热成像温湿指数阈值。

目的:研究体表温度(BST)与温度湿度指数(THI)之间的关系，并验证THI作为野外热应激指标的有效性。方法:8头20 ~ 32月龄的韩宇小母牛进行田间试验，每头猪舍面积为10 m2。BST采用红外热像仪测量。在每个季节，每天7次(07、09、11、13、15、17和19 h)测量5个身体部位(眼、后躯、鼻、部分角和耳)的BST、环境温度和相对湿度(RH)，共3个重复。结果:春季(AT， -1.0℃~ 13.4℃)THI为34.0 ~ 56.9，夏季(AT, 24.9℃~ 33.6℃)THI为75.1 ~ 84.7，秋季(AT, 13.0℃~ 26.0℃)THI为55.8 ~ 70.9，冬季(AT， -10.4℃~ 1.0℃)THI为17.5 ~ 39.2。在回归分析中，眼睛、后腿、鼻子、部分角和耳朵区域的THI与BST的决定系数(R2)分别为0.88、0.72、0.83、0.86和0.85。这表明BST与AT和RH有很强的相关性。通过简单的线性回归分析，本实验的表达方程为Y (THI) = 31.54+0.1085X(眼睛BST)和Y (THI) = 30.48+0.1147X(后腿BST)。结论:因此，热应力估计的上限可以在THI 65(眼睛)到70(后腿)之间指定。由此，我们可以期待在田地里为韩国本土牛提供精确的喂养系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Asian-Australasian Journal of Animal Sciences AGRICULTURE, DAIRY & ANIMAL SCIENCE-

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0.00%

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审稿时长

3 months

期刊介绍： Asian-Australasian Journal of Animal Sciences (AJAS) aims to publish original and cutting-edge research results and reviews on animal-related aspects of the life sciences. Emphasis will be placed on studies involving farm animals such as cattle, buffaloes, sheep, goats, pigs, horses, and poultry. Studies for the improvement of human health using animal models may also be publishable. AJAS will encompass all areas of animal production and fundamental aspects of animal sciences: breeding and genetics, reproduction and physiology, nutrition, meat and milk science, biotechnology, behavior, welfare, health, and livestock farming systems.