Genetic analysis of heat tolerance in crossbred dairy cattle performing in sub- Saharan Africa

Dooso, R., Ekine-Dzivenu, C., Mrode, R., Ojango, J. , Kipkosgei, G., Gebreyohanes G., Bennewitz, J., Okeyo, M., and Chagunda, M.
Genetic analysis of heat tolerance in crossbred dairy cattle performing in sub- Saharan Africa

Description

Temperature-humidity index (THI) was used to measure heat stress

65,261 milk yield records from 1,547 crossbred cows in semi-arid pasture-based (SAP), semi-arid arable (SAA) and semi-humid (SH) regions of Kenya were analyzed
Reaction norm models were used to quantify two heat tolerance indicators:

  • Directional change in milk yield due to heat stress
  • Stability of milk production during heat stress

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