First night effect alters occipital brain connectivity in horses

Area of Science:

• Equine behavior and physiology
• Sleep science
• Animal welfare research

Background:

• The First Night Effect describes reduced sleep quality in unfamiliar settings.
• Horses frequently travel for competitions, raising concerns about sleep disruption.
• Understanding this effect in horses is crucial for their well-being during transport and events.

Purpose of the Study:

• To determine if the First Night Effect is detectable in horses.
• To compare sleep patterns in horses from different environments (sports vs. breeding barns).
• To evaluate the efficacy of electroencephalography (EEG) versus behavioral observation in detecting the First Night Effect.

Main Methods:

• Compared EEG and behavioral data from five sports horses and six breeding horses.
• Monitored horses in unfamiliar environments to observe sleep changes.
• Analyzed EEG patterns, particularly in the delta band at the occipital region.

Main Results:

• EEG changes indicative of the First Night Effect were identified in both horse populations.
• Delta band activity at the occipital lobe showed the most significant changes.
• EEG data were more sensitive than behavioral data in detecting the First Night Effect.

Conclusions:

• The First Night Effect is observable in horses via EEG.
• EEG monitoring is a valuable tool for assessing equine welfare, stress, and pain.
• Further research can utilize EEG to improve management of horses in new environments.