Thermography is an imaging method which registers infrared waves in the electromagnetic spectrum that are emitted by all objects on the Earth. The state and properties of the studied objects and organisms can be evaluated by analyzing images of temperature distribution on their surface. Thermography has numerous practical applications, including in construction, industry, and the military and civil services. In natural sciences, thermal imaging techniques support safe and non-invasive measurements and the acquisition of results that cannot be obtained by any other method. Infrared thermography also creates a wide range of applications for human and veterinary medicine, ecology, zoology, and other natural sciences. Thermal imaging equipment is used to detect injuries, inflammations, and infectious diseases to control reproduction (detection of estrus and pregnancy, determination of male fertility) and lactation processes. The discussed method is applied to investigate thermoregulation in animals, to analyze the effect of environmental factors on animal behavior, to localize individuals and their habitats, and to determine the size of wildlife populations. Despite a wide range of practical applications, thermal imaging has a number of limitations which should be taken into account in studies that rely on infrared thermography techniques.
The aim of the present study was to characterise carcass weights of the European fallow deer harvested during the hunting seasons 2001/2002-2004/2005 in four provinces of northern Poland. The average carcass weights of bucks, does and fawns harvested throughout the study period in the given area were 48.81 kg, 32.51 kg and 20.79 kg, respectively. Carcass weights of the fallow deer were found to be higher in provinces with a high percentage of farmland and lower in provinces with a high percentage of woodland area. In fall and winter carcass weights of bucks and fawns fluctuated: the highest body weights of bucks and fawns were recorded in October (65 kg) and December (25 kg), respectively. However, there were no considerable changes observed in body weights of does. Carcass weights of bucks and fawns were temperature-dependent, while precipitation totals affected only carcass weights of the youngest animals.
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