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Title: Infrared thermal imaging as a method to evaluate heat loss in newborn lambs
Contributor(s): Labeur, L  (author)orcid ; Villiers, G (author); Small, A H (author); Hinch, Geoffrey  (author)orcid ; Schmoelzl, Sabine  (author)
Publication Date: 2017
DOI: 10.1016/j.rvsc.2017.09.023
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Abstract: Thermal imaging technology has been identified as a potential method for non-invasive study of thermogenesis in the neonatal lamb. In comparison to measurement of the core body temperature, infrared thermography may observe thermal loss and thermogenesis linked to subcutaneous brown fat depots. This study aimed to identify a suitable method to measure heat loss in the neonatal lamb under a cold challenge. During late pregnancy (day 125), ewes were subjected to either shearing (n = 15) or mock handling (sham-shorn for 2 min mimicking the shearing movements) (n = 15). Previous studies have shown an increase in brown adipose tissue deposition in lambs born to ewes shorn during pregnancy and we hypothesized that the shearing treatment would impact thermoregulatory capacities in newborn lambs. Lambs born to control ewes (n = 14; CONTROL) and shorn ewes (n = 13; SHORN) were subjected to a cold challenge of 1 h duration at 4 h after birth. During the cold challenge, thermography images were taken every 10 min, from above, at a fixed distance from the dorsal midline. On each image, four fixed-size areas were identified (shoulder, mid loin, hips and rump) and the average and maximum temperatures of each recorded. In all lambs, body surface temperature decreased over time. Overall the SHORN lambs appeared to maintain body surface temperature better than CONTROL lambs, while CONTROL lambs appeared to have higher core temperature. At 30 min post cold challenge SHORN lambs tended to have higher body surface temperatures than lambs (P = 0.0474). Both average and maximum temperatures were highest at the hips. Average temperature was lowest at the shoulder (P < 0.05), while maximum temperatures were lowest at both shoulder and rump (P < 0.005). These results indicate that lambs born to shorn ewes maintained their radiated body surface temperature better than CONTROL lambs. In conjunction with core temperature changes under cold challenge, this insight will allow us to understand whether increased body surface temperature contributes to increased overall heat loss or whether increased body surface temperature is indeed a mechanism contributing to maintenance of core body temperature under cold challenge conditions. This study has confirmed the utility of infrared thermography images to capture and identify different levels of thermoregulatory capacity in newborn lambs.
Publication Type: Journal Article
Source of Publication: Research in Veterinary Science, v.115, p. 517-522
Publisher: Elsevier Ltd
Place of Publication: United Kingdom
ISSN: 1532-2661
Fields of Research (FoR) 2008: 070206 Animal Reproduction
070207 Humane Animal Treatment
070203 Animal Management
Fields of Research (FoR) 2020: 300305 Animal reproduction and breeding
300306 Animal welfare
300302 Animal management
Socio-Economic Objective (SEO) 2008: 830310 Sheep - Meat
830311 Sheep - Wool
Socio-Economic Objective (SEO) 2020: 100412 Sheep for meat
100413 Sheep for wool
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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