Journal
ANIMAL SCIENCE JOURNAL
Volume 88, Issue 1, Pages 190-194Publisher
WILEY
DOI: 10.1111/asj.12662
Keywords
coat color; hair color; hair cortisol; heat stress; serotonin
Categories
Funding
- Cooperative Research Program for Agriculture Science and Technology Development, Rural Development Administration, Republic of Korea [PJ010209]
- Rural Development Administration (RDA), Republic of Korea [PJ010209012016] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The deleterious effects of heat stress on animal health are being increasingly recognized. This study aimed to determine hair cortisol (HC) and serotonin levels in lactating Holstein cows under heat stress conditions with different coat and hair-cut color. Forty-five multiparous lactating Holstein cows (days in milk=130 +/- 47, body weight=753 +/- 85kg) were divided to two main groups of over 80% black coat color (BC) and over 85% white coat color (WC) visually observed based on registry certificates and subdividing to black hair sample (BH) and white hair samples (WH) in 2x2 factorial arrangements. Hair samples were taken from the forehead of the individuals. Higher HC levels were observed in BC than WC cows (P<0.05). No differences were found in HC levels between BH and WH groups (P>0.05). Serotonin levels showed no difference between BC and WC (P>0.05). Interaction between coat color and hair color was not significant (P>0.05). The cortisol levels in hair are not affected by pigmentation. However, pigmentation within the coat alters cortisol levels. In conclusion, white coat color retains less cortisol than the black coat. Therefore, white coats are preferable for dairy cows under heat stress conditions.
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