Scientia Agricultura Sinica ›› 2022, Vol. 55 ›› Issue (22): 4513-4525.doi: 10.3864/j.issn.0578-1752.2022.22.015

• ANIMAL SCIENCE·VETERINARY SCIENCE • Previous Articles     Next Articles

Risk Zoning of Heat Stress Risk Zoning of Dairy Cows in Jiangsu Province and Its Characteristics Affected by Climate Change

REN Yifang1(),YANG ZhangPing2(),LING Fenghua3,XIAO LiangWen4   

  1. 1Jiangsu Meteorological Service Center, Nanjing 210008
    2College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu
    3College of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210008
    4Jiangsu Zhenyuan Applied Meteorology Research Institute Co., Ltd, Nanjing 211100
  • Received:2021-09-01 Accepted:2022-08-03 Online:2022-11-16 Published:2022-12-14
  • Contact: ZhangPing YANG E-mail:renyifang2006@126.com;yzp@yzu.edu.cn

Abstract:

【Objective】 The aim of this study was to master the occurrence law of cow heat stress under the background of climate change to optimize the production management of pasture and to promote ecological and healthy breeding level of dairy cows, which could provide the reference for optimizing the layout of animal husbandry, intelligent management and control of pasture, site selection and transformation, benefit improvement and so on. 【Method】Taking Jiangsu Province as an example, the risk index (RI) was constructed based on the temperature humidity index (THI) by using the Era5 data set of global atmospheric reanalysis data from 1980 to 2020, which represented the degree of cow heat stress. The K-means clustering algorithm was selected to realize the risk zoning of heat stress of dairy cows, and the regional evaluation was carried out in combination with the characteristics of occurrence intensity, frequency, start and end time, as well as duration of heat stress. The climate tendency rate was calculated to analyze the change trend of the characteristics of cow heat stress in the different risk areas. Based on the cumulative temperature humidity index (CTHI), Mann-Kendall test was used to determine the climate mutation points in the different risk areas. Furthermore, the impacts of climate change on the occurrence characteristics of cow heat stress in different risk areas were analyzed from the daily and hourly time scales, respectively. 【Result】The risk of heat stress of dairy cows in Jiangsu Province presented the distribution features of "high in the southwest and low in the northeast". The low-risk areas mainly included Huaibei and the middle-eastern area of Yangtze River and Huai River valley. The regional averaged value of THI was 73.63, and the mild heat stress mainly occurred. The high-risk areas mainly included the areas along the southern Jiangsu and the west area of Yangtze River and Huai River valley. The regional averaged value of THI was 75.12, and the occurrence frequency of mild and moderate thermal stress was nearly the same. In the low-risk and high-risk areas, the start and end time of heat stress showed an advanced and delay trend, and the duration days showed an extended trend of 4.0 d/(10a) and 4.2 d/(10a), respectively, the values of THI all showed an increasing trend of 0.2/(10a), while the value of CTHI showed an increasing trend of 301.2/(10a) and 256.1/(10a), respectively. The frequencies of mild thermal stress were bimodal, which mainly occurred from the early-June to the mid-July, and from the early-August to the middle-September, while the frequency of moderate thermal stress was unimodal, which mainly occurred from mid-July to mid-August. The change of daily heat stress intensity basically presented a distribution of "sinusoidal", and the high incidence period was concentrated in 11:00-17:00. Affected by climate change, the heat stress of dairy cows in Jiangsu Province showed an obvious increasing trend, reaching a small peak in 2010. Then after a decline, it showed a steady strengthening trend, which exceeded the threshold of 0.05 significance level. In the low and high risk areas, the highly impacted periods of cow heat stress were prolonged, the occurrence frequency increased, the coverage increased, and the starting-time moved forward. The daily beginning time of the high incidence period of cow heat stress moved forward for about 1 hour, and the intensity of heat stress in high-risk areas was basically increased close to the medium level. 【Conclusion】 Based on THI, RI and CTHI, the risk zoning assessment and climate impact analysis of cow heat stress could be realized, the high-risk areas as well as key prevention and control periods of cow heat stress could be determined, and the climate change trend could be grasped. With the climate change, the heat stress of dairy cows in Jiangsu Province showed the characteristics of "earlier, stronger, longer and more", which should be actively dealt with.

Key words: Jiangsu Province, cow, heat stress, risk zoning assessment, climate change

Table 1

Evaluation criteria of heat stress in dairy cows"

轻Slight 中Moderate 重Severe
热应激等级
Grade of heat stress (k)
1 2 3
温湿指数
Temperature humidity index (THI)
72≤THI≤79 79<THI≤88 THI>88

Fig. 1

Risk zoning of heat stress of dairy cows in Jiangsu Province"

Fig. 2

During the monitoring period, the spatial distribution of risk index value (a), multi-year average value of damp heat index (b), and occurrence frequency of slight (c) and moderate (d) heat stress in the different risk areas"

Fig. 3

Annual changes of the begin time, end time and duration of heat stress in (a) low and (b) high risk area of dairy cows heat stress"

Table 2

Statistics of heat stress risk assessment factors of dairy cows in the different risk areas in Jiangsu Province"

区域
Area
风险度
Risk index
温湿指数多年均值
Multi-year average value of temperature humidity index
轻度热应激发生频率
Occurrence frequency of slight heat stress
中度热应激发生频率
Occurrence frequency
of moderate heat stress
开始时间
Begin time
结束时间
End time
持续时间
Duration
(d)
低风险区Low risk 47.95 73.63 0.41 0.20 6月11日 9月16日 97
高风险区High risk 54.42 75.12 0.38 0.30 6月8日 9月16日 100

Fig. 4

The annual changes of regional averaged temperature humidity index (a), heat stress days (b), cumulative temperature humidity index (c), as well as MK test of cumulative temperature humidity index (d) for the different risk areas"

Fig. 5

During the monitoring period, the frequency distribution of different degrees of heat stress before (1981-2002) (a) and after (2003-2020) (b) climate mutations in the low-risk areas, as well as before (1981-2004) (c) and after (2005-2020) (d) climate mutation in the high-risk areas of cow heat stress"

Table 3

Statistics of start-stop dates and coverage of different heat stress levels for dairy cows in the different risk areas"

低风险区Low-risk areas 高风险区High-risk areas
气候突变前
Before climate mutation
气候突变后
After climate mutation
气候突变前
Before climate mutation
气候突变后
After climate mutation
Feqshs第一高峰期
First peak period of Feqshs
起止日期Start-end dates 6/16-7/19 6/6-7/17 6/8-7/13 6/6-7/16
覆盖度Coverage (%) 25.5 29.8 24.8 27.6
均值Average 0.62 0.63 0.52 0.56
Feqshs第二高峰期
Second peak period
of Feqshs
起止日期Start-end dates 8/4-9/8 8/15-9/10 8/12-9/13 8/20-9/18
覆盖度Coverage (%) 24.1 18.4 21.9 0.20
均值Average 0.61 0.54 0.58 0.58
Feq_mhs高峰期
Peak period of Feqmhs
起止日期Start-end dates 7/23-8/3 7/18-8/13 7/14-8/10 7/10-8/19
覆盖度Coverage (%) 5.7 16.0 72 77.3
均值Average 0.65 0.67 0.72 0.8
THI高峰时段
Peak period of THI
起止日期Start-end dates 11:00-17:00 10:00-17:00 11:00-17:00 10:00-17:00
均值Average 76.5 77.0 77.0 77.7

Fig. 6

Diurnal variation of temperature humidity index before and after climate mutation in the different heat stress risk areas of dairy cows"

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