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Animal Genetic Improvement in Tropical Area

Animal Genetic Improvement in Tropical Area. Dr. Wuttigrai Boonkum Department of Animal Science, Faculty of Agriculture Khon Kaen University. Why is heat stress important ?. HOT, HOTTER Temperatures have risen more in the Arctic than in the tropics. The Tropics.

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Animal Genetic Improvement in Tropical Area

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  1. Animal Genetic Improvement in Tropical Area Dr. WuttigraiBoonkum Department of Animal Science, Faculty of Agriculture KhonKaen University

  2. Why is heat stress important ? HOT, HOTTER Temperatures have risen more in the Arctic than in the tropics. The Tropics

  3. Why is heat stress important ? Heat stress low milk yield low feed intake die low fertility well-being

  4. Economic losses Economic impacts of heat wave on dairy industry about $1 Billion • 2003 economic loss $897 to $1500 million in US • 2006 California heat wave kills 16,500 dairy cows statewide >2,000 cattle died in Nebraska during June 2009 2002 to 2007, Summer was the seasons with the highest of dairy deaths (15,773) in Italy

  5. How heat stress occur ? Lower critical temp. Upper critical temp. Cold stress Thermoneutral zone 4-24 oC Heat stress humidity Heat production Ambient temperature

  6. Heat stress effects THI > 72 for production and around 68 for reproduction are considered to indicate heat stress in dairy cattle

  7. respiration rumination sweating feed intake water intake panting How heat stress occur ? Heat stress

  8. x How to reduce the effects of heat stress ? Production traits adjustment of housing and facilities Feed and Feeding management Crossbreeding system B.indicus B.taurus

  9. How to reduce the effects of heat stress ? Fertility traits avoiding breeding during hot conditions estrus synchronization timed artificial insemination

  10. x Alternative method Production traits Fertility traits Genetic selection avoiding breeding during hot season estrus synchronization timed artificial insemination Housing and Shading management Feed and Feeding management Crossbreeding system Temporary/non sustainable   B.indicus B.taurus Temporary/non sustainable

  11. What traits are interest to study? Genetic selection Ravagnolo and Misztal, (2000) • Using regular monthly milk records • THI information at the collecting date • Using days open records How heat stress affect on genetic ?

  12. Heat stress in Thailand Stress all time

  13. Results: Determination of heat stress threshold

  14. Publication

  15. Results: LSM and HI for DO summer winter

  16. ปัจจัยที่สัมพันธ์ต่อการเกิดความเครียดเนื่องจากร้อนในโคนมปัจจัยที่สัมพันธ์ต่อการเกิดความเครียดเนื่องจากร้อนในโคนม • Length of exposure to heat stress • Level of production • Stage of lactation • Cooling management • Feed consumption • Feed offered • Breed • cattle species • Size of the animal

  17. Implications : Threshold point Best genetic performance for milk production under heat stress conditions National genetic evaluation under hot-humid climates of Thailand Estimated breeding value; EBV Department of Animal Science, Faculty of Agriculture, Khon Kaen University THI

  18. Animal 1 Animal 2 Genetic effect Ent1 Ent2 No G x E interaction Animal 1 Animal 2 Genetic effect Genetic effect Animal 2 Animal 1 Ent1 Ent2 Ent1 Ent2 Scaling G x E interaction Reranking G x E interaction

  19. Conclusions

  20. ค่า EBV ของพ่อพันธุ์โคนมของกรมปศุสัตว์ปี 2553

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