Radiated temperature of weaned piglets and the response to in-feed antibiotics with correction for ambient conditions

Author:

Cook Nigel J.1,Chabot Brady2,Liu Tong2,Froehlich Denise1,Juàrez Manuel2

Affiliation:

1. Alberta Agriculture and Forestry, Lacombe Research Centre, Lacombe, AB T4L 1W1, Canada.

2. Agriculture and Agri-Food Canada, Lacombe Research Centre, Lacombe, AB T4L 1W1, Canada.

Abstract

Growth performance, health status, and the radiated thermal temperatures of groups of piglets consuming non-medicated feed and in-feed antibiotics (chlortetracycline hydrochloride and tiamulin) were monitored continuously for up to 35 d, from weaning at 28 d of age until moving to commercial pens at approximately 63 d of age. There was a trend (P = 0.1) for body weight at the time of moving to be higher for the medicated animals. The average daily gain was higher in medicated piglets (P = 0.03). Radiated temperature variables were the maximum (Tmax) and the average (Tmean) pig temperatures, and both were higher for the medicated piglets (P < 0.0001). A threshold temperature was derived to partition the image and derive the background radiated temperature that was used to obtain the expected radiated temperature of the pigs. Temperature data were adjusted for environmental effects by expressing the residual temperature. The residual for Tmax (TmaxRes) and for Tmean (TmeanRes) were higher in medicated piglets (P < 0.0001). In-feed antibiotics were associated with increased growth rates and with an increase in radiated temperature variables, particularly those corrected for environmental conditions, possibly mediated through increased metabolic activity related to growth.

Publisher

Canadian Science Publishing

Subject

Animal Science and Zoology,Food Animals

Reference14 articles.

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3. Infrared thermography detects febrile and behavioural responses to vaccination of weaned piglets

4. The automated analysis of clustering behaviour of piglets from thermal images in response to immune challenge by vaccination

5. ANTIBIOTICS AS GROWTH PROMOTANTS:MODE OF ACTION

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