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Heat stress effects on Holstein dairy cows' rumination
Summary
Higher temperature-humidity index (THI) significantly reduces rumination time (RT) in dairy cows. This finding suggests THI could be a key indicator for monitoring and improving animal welfare on farms.
Area of Science:
- Animal Science
- Environmental Physiology
- Dairy Husbandry
Background:
- Heat stress negatively impacts dairy cow health and productivity.
- Rumination time is a crucial indicator of digestive health and overall well-being in cattle.
- The temperature-humidity index (THI) is a common metric for assessing heat stress.
Purpose of the Study:
- To investigate the relationship between the temperature-humidity index (THI) and rumination time (RT) in Italian Holstein dairy cows.
- To determine if THI can be utilized as a tool for enhancing animal welfare.
- To quantify the impact of THI on rumination behavior.
Main Methods:
- Data collection occurred on an Italian dairy farm from June to August 2015.
- Environmental data (temperature, humidity) were recorded using an in-barn weather station.
- Rumination time and activity were monitored using the Heatime® HR system with neck collars.
Main Results:
- A significant negative correlation was found between rumination time (RT) and the temperature-humidity index (THI).
- Mixed linear models confirmed a statistically significant effect of THI on RT.
- As THI increased, rumination time decreased, indicating reduced cow comfort.
Conclusions:
- Increased THI is associated with decreased rumination time in dairy cows.
- THI is a reliable indicator of heat stress affecting cow welfare.
- Monitoring THI can help implement timely interventions to mitigate heat stress and improve animal welfare.
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