Asian-Australasian Journal of Animal Sciences

  • 제32권3호
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  • Pages.334-340
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  • 2019
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  • 1011-2367(pISSN)
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  • 1976-5517(eISSN)
아세아태평양축산학회 (Asian Australasian Association of Animal Production Societies)
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Estimation of the genetic milk yield parameters of Holstein cattle under heat stress in South Korea

  • Lee, SeokHyun (Animal Breeding & Genetics Division, National Institute of Animal Science, RDA) ;
  • Do, ChangHee (Division of Animal and Dairy Science, Chungnam National University) ;
  • Choy, YunHo (Animal Breeding & Genetics Division, National Institute of Animal Science, RDA) ;
  • Dang, ChangGwon (Animal Breeding & Genetics Division, National Institute of Animal Science, RDA) ;
  • Mahboob, Alam (Animal Breeding & Genetics Division, National Institute of Animal Science, RDA) ;
  • Cho, Kwanghyun (Department of Dairy Science, Korea National College of Agriculture and Fisheries)
  • 투고 : 2018.03.30
  • 심사 : 2018.07.12
  • 발행 : 2019.03.01
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초록

Objective: The objective of this study was to investigate the genetic components of daily milk yield and to re-rank bulls in South Korea by estimated breeding value (EBV) under heat stress using the temperature-humidity index (THI). Methods: This study was conducted using 125,312 monthly test-day records, collected from January 2000 to February 2017 for 19,889 Holstein cows from 647 farms in South Korea. Milk production data were collected from two agencies, the Dairy Cattle Genetic Improvement Center and the Korea Animal Improvement Association, and meteorological data were obtained from 41 regional weather stations using the Automated Surface Observing System (ASOS) installed throughout South Korea. A random regression model using the THI was applied to estimate genetic parameters of heat tolerance based on the test-day records. The model included herd-year-season, calving age, and days-in-milk as fixed effects, as well as heat tolerance as an additive genetic effect, permanent environmental effect, and direct additive and permanent environmental effect. Results: Below the THI threshold (${\leq}72$; no heat stress), the variance in heat tolerance was zero. However, the heat tolerance variance began to increase as THI exceeded the threshold. The covariance between the genetic additive effect and the heat tolerance effect was -0.33. Heritability estimates of milk yield ranged from 0.111 to 0.176 (average: 0.128). Heritability decreased slightly as THI increased, and began to increase at a THI of 79. The predicted bull EBV ranking varied with THI. Conclusion: We conclude that genetic evaluation using the THI function could be useful for selecting bulls for heat tolerance in South Korea.

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참고문헌

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  2. Heat Stress Impacts on Lactating Cows Grazing Australian Summer Pastures on an Automatic Robotic Dairy vol.10, pp.5, 2019, https://doi.org/10.3390/ani10050869
  3. Selection for Test-Day Milk Yield and Thermotolerance in Brazilian Holstein Cattle vol.11, pp.1, 2019, https://doi.org/10.3390/ani11010128