The effects of stationary periods and external temperature and humidity on thermal stress conditions within sheep transport vehicles

Abstract

Increases in the THI that could be detrimental to the welfare of sheep could occur on stationary sheep transport vehicles at most daytime ambient temperatures during summer. For a given stocking density and vehicle design, the THI of a pen increased in proportion to the duration of the stationary period. Mild ambient conditions (<25 degrees C) provided some protection against excessive THI increases if the duration of the stop was limited, but drivers are best advised to park their vehicles where there is airflow, and to minimise the duration of stops where possible. Livestock transport vehicles during summer should not be placed on enclosed ferry decks where airflow is absent or minimal.