2015 Fiscal Year Final Research Report
A study on heat tolerance traits of beef cattle
| Project/Area Number |
24580395
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Zootechnical science/Grassland science
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Keywords | heat stress / beef cattle / reproduction / THI / heat tolerance / Japanese Black / piecewise regression |
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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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| Free Research Field |
動物遺伝育種学
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