[국내논문]Effects of heat stress on body temperature, milk production, and reproduction in dairy cows: a novel idea for monitoring and evaluation of heat stress - A review원문보기논문타임라인
Liu, Jiangjing
(Institute of Animal Science, Chinese Academy of Agricultural Sciences)
,
Li, Lanqi
(Institute of Animal Science, Chinese Academy of Agricultural Sciences)
,
Chen, Xiaoli
(Institute of Animal Science, Chinese Academy of Agricultural Sciences)
,
Lu, Yongqiang
(Animal Husbandry Station of Beijing)
,
Wang, Dong
(Institute of Animal Science, Chinese Academy of Agricultural Sciences)
Heat stress exerts a substantial effect on dairy production. The temperature and humidity index (THI) is widely used to assess heat stress in dairy operations. Herein, we review the effects of high temperature and humidity on body temperature, feed intake, milk production, follicle development, estr...
Heat stress exerts a substantial effect on dairy production. The temperature and humidity index (THI) is widely used to assess heat stress in dairy operations. Herein, we review the effects of high temperature and humidity on body temperature, feed intake, milk production, follicle development, estrous behavior, and pregnancy in dairy cows. Analyses of the effects of THI on dairy production have shown that body temperature is an important physiological parameter in the evaluation of the health state of dairy cows. Although THI is an important environmental index and can help to infer the degree of heat stress, it does not reflect the physiological changes experienced by dairy cows undergoing heat stress. However, the simultaneous measurement of THI and physiological indexes (e.g., body temperature) would be very useful for improving dairy production. The successful development of automatic detection techniques makes it possible to combine THI with other physiological indexes (i.e., body temperature and activity), which could help us to comprehensively evaluate heat stress in dairy cows and provide important technical support to effectively prevent heat stress.
Heat stress exerts a substantial effect on dairy production. The temperature and humidity index (THI) is widely used to assess heat stress in dairy operations. Herein, we review the effects of high temperature and humidity on body temperature, feed intake, milk production, follicle development, estrous behavior, and pregnancy in dairy cows. Analyses of the effects of THI on dairy production have shown that body temperature is an important physiological parameter in the evaluation of the health state of dairy cows. Although THI is an important environmental index and can help to infer the degree of heat stress, it does not reflect the physiological changes experienced by dairy cows undergoing heat stress. However, the simultaneous measurement of THI and physiological indexes (e.g., body temperature) would be very useful for improving dairy production. The successful development of automatic detection techniques makes it possible to combine THI with other physiological indexes (i.e., body temperature and activity), which could help us to comprehensively evaluate heat stress in dairy cows and provide important technical support to effectively prevent heat stress.
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문제 정의
The temperature-humidity index (THI) is often used as an important environmental assessment index to evaluate heat stress in dairy production [19,20]. Studies that focus on the relationship between THI and body temperature will help us to understand the physiological status of cows exposed to different THI conditions, which is of great significance to the feeding and management of cows. Herein, we review the effects of ambient temperature and humidity on the body temperature of cows, as well as the effects of heat stress on feed intake, milk production, follicular development, estrus, and pregnancy.
가설 설정
Although THI integrates ambient temperature and humidity information to assess heat stress, there are still many shortcomings in the research performed to date. First, the precision of THI monitoring was not sufficient. Many studies only used seasonal averages, where only a few working days were monitored.
제안 방법
The effects of heat stress on pregnancy rate were explored in another study involving 1,199 crossbred dairy cows for 30 days before and after insemination. In this study, according to whether the ambient THI values less than 72 or not, the cows were divided into four groups: thermoneutral-thermoneutral (TN-TN), thermoneutral-heat stress (TN-HS), heat stress-thermoneutral (HS-TN), and heat stress-heat stress (HS-HS). The results showed that the pregnancy rate in the HS-HS group (20.
성능/효과
The results showed that the pregnancy rate in the HS-HS group (20.5%) was significantly lower than those of the TNTN (32.6%), TN-HS (30.3%), and HS-TN (31.8%) groups (p<0.05), while there were no significant differences between the latter three groups (p>0.05) [62].
, morning, noon, and night) were used when monitoring working days. As a result, the results of monitoring were intermittent, did not record circadian changes in THI, and could not timely and precisely reflect the heat stress status of the cows. Second, it is not adequate for all regions and farms to determine the state of heat stress according to whether THI exceeds 68 or 72.
As a result, the results of monitoring were intermittent, did not record circadian changes in THI, and could not timely and precisely reflect the heat stress status of the cows. Second, it is not adequate for all regions and farms to determine the state of heat stress according to whether THI exceeds 68 or 72. Instead, specific problems should be analyzed more concretely.
후속연구
Herein, we review the effects of ambient temperature and humidity on the body temperature of cows, as well as the effects of heat stress on feed intake, milk production, follicular development, estrus, and pregnancy. We hope that this review will provide theoretical guidance for the feeding and management of dairy cows.
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