干旱区生态环境知识资源中心(Arid): Do newborn lambs with black and white hair-coats in an equatorial semi-arid environment maintain homeothermy?

Arid

DOI	10.1007/s00484-024-02710-9
	Do newborn lambs with black and white hair-coats in an equatorial semi-arid environment maintain homeothermy?
	Fonseca, V. F. C.; Dos Santos, J. D. C.; Saraiva, E. P.; Neta, G. C. Xavier; Morais, L. K. C.; Bicego, K. C.; Pereira, W. E.; Filho, E. C. Pimenta; Moura, G. A. B.; Sejian, V.; Fuller, A.
通讯作者	Fonsêca, VFC
来源期刊	INTERNATIONAL JOURNAL OF BIOMETEOROLOGY
ISSN	0020-7128
EISSN	1432-1254
出版年	2024
英文摘要	We assessed newborn lambs from two hair-coat sheep breeds, the black Santa Ines (n = 29) and white Dorper (n = 26), to determine how they behaviourally and physiologically respond to the prevailing thermal conditions in an equatorial semi-arid environment. Measurements of hair-coat surface temperature, rectal temperature and the lambs' exposure to sun were recorded across the first 24 h of life every hour, after the lambs had received colostrum. Lambs and ewes were kept in a lambing pen and could freely move between a shaded area or be exposed to sun. During the study period, the air temperature ranged between 20 degrees C and 34 degrees C. When exposed to sun, lambs and ewes could experience as much as 1200 W m(-2) of solar irradiance. Santa Ines lambs exhibited higher (highest density interval at 95%, HDI) hair-coat surface temperatures than did Dorper lambs. Overall, both Santa Ines and Dorper lambs sustained homeothermy, with a mean rectal temperature ranging from 38.7 degrees C to 39.1 degrees C between night and daytime phase, and a mean amplitude of similar to 0.8 degrees C. Nevertheless, from 10:00 to 15:00, some lambs were found to be moderately hyperthermic. Five Santa Ines and three Dorper lambs had rectal temperatures above 40 degrees C, and one Santa Ines lamb, while exposed to sun, had a rectal temperature of 41.3 degrees C. Over this time period, lambs were more likely to move to shade (HDI at 95%). From 00:00 to 06:00, despite the air temperature being lower than the hair-coat surface, favouring high rates of sensible heat loss to the environment, no lamb exhibited signs of hypothermia (rectal temperature < 37.5 degrees C). In conclusion, haired newborn lambs coped well with high levels of radiant heat during the daytime and lower temperatures at night. However, providing access to shade during the daytime is important to improve the welfare of newborn lambs delivered in equatorial semi-arid regions.
英文关键词	Animal welfare Sheep production Neonates Radiant heat Thermoregulation
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001249553100001
WOS关键词	THERMOREGULATORY RESPONSES ; TEMPERATURE REGULATION ; THERMOGENESIS ; WEIGHT ; BREED
WOS类目	Biophysics ; Environmental Sciences ; Meteorology & Atmospheric Sciences ; Physiology
WOS研究方向	Biophysics ; Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences ; Physiology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404210
推荐引用方式 GB/T 7714	Fonseca, V. F. C.,Dos Santos, J. D. C.,Saraiva, E. P.,et al. Do newborn lambs with black and white hair-coats in an equatorial semi-arid environment maintain homeothermy?[J],2024.
APA	Fonseca, V. F. C..,Dos Santos, J. D. C..,Saraiva, E. P..,Neta, G. C. Xavier.,Morais, L. K. C..,...&Fuller, A..(2024).Do newborn lambs with black and white hair-coats in an equatorial semi-arid environment maintain homeothermy?.INTERNATIONAL JOURNAL OF BIOMETEOROLOGY.
MLA	Fonseca, V. F. C.,et al."Do newborn lambs with black and white hair-coats in an equatorial semi-arid environment maintain homeothermy?".INTERNATIONAL JOURNAL OF BIOMETEOROLOGY (2024).