Heat stress from current and predicted increases in temperature impairs lambing rates and birth weights in the Australian sheep flock
2024-03-01 NATURE FOOD 2024 5(卷), 3(期), (null页)
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Livestock heat stress threatens production, particularly in semi-arid, arid and tropical regions. Using established temperature thresholds for sheep, we modelled +1 degrees C and +3 degrees C temperature increases over the historical baseline, estimating that 2.1 million potential lambs are lost annually due to heat stress alone, increasing to 2.5 and 3.3 million, respectively, as temperatures rise. Heat stress poses risks at key periods of the reproductive cycle, with consequences across the Australian sheep flock. Temperature increases of 1 degrees C and 3 degrees C arising from climate change will likely increase risks for tropical sheep production with negative impacts on ewe fertility, milk production and lamb survival rates.
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