Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A Study on the Effect of Temperature-Humidity Index on the Respiration Rate, Rectal Temperature and Rumination Time of Lactating Holstein Cow in Summer Season

고온기 온습도지수가 홀스타인종 젖소 착유우의 호흡수, 직장온도 및 반추활동 시간에 미치는 영향 연구

  • Park, Ji Hoo (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Choi, Hee Chul (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Lee, Hyun Jeong (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Kim, Eun Tae (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Son, Jun Kyu (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Kim, Dong Hyeon (Dairy Science Division, National Institute of Animal Science, Rural Development Administration)
  • 박지후 (농촌진흥청 국립축산과학원 낙농과) ;
  • 최희철 (농촌진흥청 국립축산과학원 낙농과) ;
  • 이현정 (농촌진흥청 국립축산과학원 낙농과) ;
  • 김언태 (농촌진흥청 국립축산과학원 낙농과) ;
  • 손준규 (농촌진흥청 국립축산과학원 낙농과) ;
  • 김동현 (농촌진흥청 국립축산과학원 낙농과)
  • Received : 2019.10.10
  • Accepted : 2019.11.01
  • Published : 2019.11.30
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Abstract

This study investigated the effects of environmental temperature and humidity on the physiological indicators such as respiratory rate, rectal temperature, and rumination time in cows. Twenty lactating Holstein cows were used for this study. The temperature/humidity index, which can be measured by the temperature and humidity of barns, was divided into three stages to distinguish the heat stress level of cows. The temperature and humidity indexes of each stage were classified into 70 ~ 75 for T1, 76 ~ 81 for T2, and 82 ~ 87 for T3, respectively. The respiratory rates per minute were 58.60 at T1, 66.12 at T2, and 84.05 at T3, respectively (P < 0.05), and the average rectal temperatures (℃) of the cows were 38.41 in T1, 38.69 in T2 and 39.05 in T3, respectively (P < 0.05). The body surface temperatures (℃) were 36.41 in T1, 36.51 in T2, and 37.39 in T3, respectively. The rumination times (minutes/day) were 473.10 in T1, 454.76 in T2, and 399.60 in T3, respectively (P < 0.05). As global warming continues to damage the dairy industry, further research is needed to improve the welfare of dairy cows and reduce their heat stress.

본 연구는 환경 온·습도가 젖소의 호흡수, 직장온도 등의 생리지표와 반추활동 시간에 미치는 영향을 알아보고자 수행되었다. 시험에 활용된 공시축은 홀스타인종 착유우 20두를 활용하였으며 젖소의 고온 스트레스 수준을 구분하기 위해 우사의 온도와 습도를 측정하여 환산된 온·습도지수(Temperature-Humidity Index)를 세 단계로 나누어 이용하였다. 각 단계별 온·습도지수는 1단계(T1)가 70~75, 2단계(T2)가 76~81, 3단계(T3)가 82~87로 구분되었다. 연구결과, 분당 호흡수(회/분)는 T1에서 58.60으로 나타났으며, T2에서는 66.12, T3에서 84.05로 나타났으며 시험축의 직장온도(℃)는 T1에서 38.41, T2에서 38.69, T3에서 39.05로 나타나 두 지표 모두 온·습도지수가 증가함에 따라 값이 유의하게 증가하였다(P < 0.05). 체표면 온도(℃)는 T1에서 36.41, T2에서 36.51, T3에서 37.39로 나타났으며 T1·T3 간 유의한 차이를 보였다(P < 0.05). 반추활동량(분/일)은 T1에서 473.10, T2에서 454.76, T3에서 399.60로 나타나 온·습도지수가 높아질수록 반추활동 시간은 감소하는 것을 확인하였다(P < 0.05). 최근 기후온난화로 인한 낙농산업의 피해가 지속될 것으로 전망됨에 따라 향후 젖소의 복지 증진과 고온 스트레스 감소 방안 마련을 위한 지속적인 연구가 필요할 것으로 보인다.

Keywords

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