| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Outline of Final Research Achievements |
In domestic cattle, including beef cattle, conception rate was observed to decrease consistently. Therefore, it has been concerned about the vitality of the organism. Heat stress was considered to be a factor of it. This study was conducted for improving heat tolerance of beef cattle genetically. In order to measure heat stress, temperature-humidity index (THI) was used. THI is calculated from temperature and humidity. Traits to quantify reproductive performance of cattle were age at first calving and calving intervals. Investigating the effect THI around an insemination day, THI of a particular day was found to be significant in its effect. This finding revealed that the THI of a particular day can be used for assessing heat stress sensitivity of cattle and exploit methodology to initiate genetic improvement for heat tolerance in cattle.
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