Effect of the Temperature-Humidity Index on Body Temperature and Conception Rate of Lactating Dairy Cows in Southwestern Japan

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概要

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• In the present study, we investigated the relationship between the temperature-humidity index (THI) and the conception rate of lactating dairy cows in southwestern Japan, one of the hottest areas of the country. We also investigated the relationship between measurement of the vaginal temperature of lactating dairy cows as their core body temperature at one-hour intervals for 25 consecutive days in hot (August-September, n=6) and cool (January-February, n=5) periods and their THI. Furthermore, we discussed the above relationship using these vaginal temperatures, the conception rates and the THI. As a result, when the conception rates from day 2 to 0 before AI were classified into day 2, 1 and 0 groups by the six maximum THI values in each group (mTHI; <61, 61-65, 66-70, 71-75, 76-80, >80), only the conception rate for the mTHI over 80 at 1 day before AI group was significantly lower (P<0.05) than the other groups. The conception rate for days 15 to 17, but not days 19 to 22 and 30 to 35, after AI in the cows that experienced average mTHI over 80 (amTHI>80) was significantly lower (P<0.05) than that of the cows that did not experience amTHI>80. There was a significant positive correlation (P<0.01) between the mTHI and the mean daily vaginal temperature, but not during the cool period. When the mTHI reached 69, the vaginal temperature started to increase. As for the relationship between the conception rates and vaginal temperatures for all mTHI classes, in the mTHI>80 at 1 day before AI group, the vaginal temperature increased by 0.6 C from 38.7 C, resulting in a reduction of 11.6% in the conception rate from 40.5%. In conclusion, these results suggest that one of the causes of the fall in conception rate of lactating dairy cows during the summer season in southwestern Japan may be an increase in their core body temperature with a higher mTHI than the critical mTHI of 69 at 1 day before AI.

• 2011-08-01

著者

• 森田 哲夫

  宮崎大学農学部

• Morita Tetsuo

  Faculty Of Agriculture Miyazaki University

• 森田 哲夫

  環境科学総合研究所

• 森田 哲夫

  宮崎大・農・食料生産

• 森田 哲夫

  宮崎大学農学部生態生理学教室

• 森田 哲夫

  宮崎大 農

• 森田 哲夫

  宮崎大

• Morita T

  Faculty Of Agriculture Miyazaki University

• Morita Tetsuo

  Department Of Animal Science Faculty Of Agriculture Miyazaki University

• 森田 哲夫

  京都大学農学部

• Morita Tetsuo

  Laboratory Of Physiological Ecology Faculty Of Agriculture University Of Miyazaki

• NABENISHI Hisashi

  Domestic Animal Biotechnology Department, Miyazaki Livestock Research Institute

• OHTA Hiroshi

  Domestic Animal Biotechnology Department, Miyazaki Livestock Research Institute

• TSUZUKI Yasuhiro

  Animal Reproduction Laboratory, Faculty of Agriculture, University of Miyazaki

• Morita Tetsuo

  Animal Nutrition Laboratory Faculty Of Agriculture University Of Miyazaki

• Ohta Hiroshi

  Domestic Animal Biotechnology Department Miyazaki Livestock Research Institute

• Tsuzuki Yasuhiro

  Animal Reproduction Laboratory Faculty Of Agriculture University Of Miyazaki

• Ashizawa Koji

  Animal Reproduction Laboratory Faculty Of Agriculture University Of Miyazaki

• NISHIMOTO Toshihumi

  Domestic Animal Biotechnology Department, Miyazaki Livestock Research Institute

• Nishimoto Toshihumi

  Domestic Animal Biotechnology Department Miyazaki Livestock Research Institute

• Nabenishi Hisashi

  Domestic Animal Biotechnology Department Miyazaki Livestock Research Institute

• Ashizawa Koji

  Animal Reproduction Lab. Fac. Of Agriculture Univ. Of Miyazaki Miyazaki 889-2192 Jpn

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