2009-2015 ©
Journal Publication
Research Title Improvement the accurate genetic estimation of milk yield trait by addition of wind speed to THI in crossbred Thai Holstein 
Date of Distribution 23 August 2016 
     Title of the Conference 17th AAAP Animal Science Congress 
     Organiser Kyushu Sangyo University 
     Conference Place Kyushu Sangyo University 
     Province/State Fukuoka 
     Conference Date 22 August 2016 
     To 25 August 2016 
Proceeding Paper
     Volume 2016 
     Issue 17 
     Page 3-6 
     Abstract The THI based on ambient temperature and relative humidity, is commonly used as an indicator of heat stress in dairy cattle. However, wind speed is another environment variable result in convective cooling and could affect to the thermal balance ability of animal. For accuracy of breeding values on milk yield trait for heat tolerance prediction in Crossbred Thai Holstein cattle, addition of wind speed to THI equation was therefore evaluated. Data included 116,828 test-day milk yield records for first lactation from 14,485 cows between 1990 and 2012. Daily temperature, humidity and wind speed data from 14 provincial weather stations were used to calculate THI1 (conventional) and THI2 (+wind speed). Analyses were used repeatability model by REMLF90 and BULPF90. Threshold point of THI1 and THI2 were 75 (75-85 interval) versus 28 (28-38 interval), respectively. The heritability (h2) and genetic correlation (rg) were 0.09-0.14 and -0.21 (THI1), 0.17-0.20 and -0.11(THI2). Coefficient of determination (R2) of THI1 and THI2 were 0.979 and 0.986, respectively. In summary, even the conventional THI is commonly useful, adjustment wind speed to THI could improve more accurately estimation of milk yield of Cross-bred Thai Holstein cattle in Thailand.  
575030088-9 Mr. WATCHARAPONG TEAWYUNEYONG [Main Author]
Agriculture Master's Degree

Peer Review Status มีผู้ประเมินอิสระ 
Level of Conference นานาชาติ 
Type of Proceeding Full paper 
Type of Presentation Oral 
Part of thesis true 
Presentation awarding false 
Attach file
Citation 0