Melatonin modulates rectal and body surface temperatures and their circadian rhythmicity in donkeys (Equus asinus) subjected to packing during the hot-dry season.

Autor: Ake AS; Department of Physiology, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria. akeayodele@gmail.com., Ayo JO; Department of Physiology, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria., Aluwong T; Department of Physiology, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria., Mohammed A; Department of Human Physiology, Faculty of Basic Medical Sciences, Ahmadu Bello University, Zaria, Nigeria., Minka NS; College of Agriculture and Animal Science, Ahmadu Bello University, P.M.B. 2134, Mando-Kaduna, Nigeria.
Jazyk: angličtina
Zdroj: International journal of biometeorology [Int J Biometeorol] 2023 Feb; Vol. 67 (2), pp. 389-404. Date of Electronic Publication: 2022 Dec 31.
DOI: 10.1007/s00484-022-02418-8
Abstrakt: The study aimed to evaluate the effects of melatonin administration on rectal and body surface temperature (RT and BST, respectively) responses and their circadian rhythmicity in donkeys subjected to packing (load carrying) during the hot-dry season. Twenty donkeys were divided into two equal groups randomly: Groups 1 (packing + melatonin) and 2 (packing - melatonin), subjected to packing and both covered 20 km. The RT, BST, and thermal environmental parameters were measured before and after packing. The procedure was carried out three times within the week, one day apart. This was followed 16-h after the last (third) packing procedure by 27-h recording period of all the parameters at 3-h intervals. The RT (37.77 ± 0.1℃) recorded in packing + melatonin donkeys was lower (P < 0.05) than in (packing - melatonin) (38.29 ± 0.1℃) post-packing, while the BSTs in packing + melatonin donkeys were lower than in (packing - melatonin) donkeys, especially the neck (33.07 ± 0.6℃ vs 35.4 ± 0.7℃, respectively) and coronary band (30.58 ± 0.5℃ vs 33.38 ± 0.7℃, respectively) temperatures. In both groups 16-h post-packing, overall mean RT and BST values were not different, except the coronary band temperature (26.61 ± 0.8℃) that was lower (P < 0.05) in packing + melatonin donkeys than (packing - melatonin) donkeys (28.78 ± 1.4℃). Melatonin-exerted biphasic effects on circadian rhythms of RT and BSTs by reducing body temperatures during the photophase and increasing the values during the scotophase in pack donkeys. In conclusion, melatonin may enhance packing output in donkeys during the hot-dry season.
(© 2022. The Author(s) under exclusive licence to International Society of Biometeorology.)
Databáze: MEDLINE
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