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Einfluß des Fangens, der Immobilization und des Handling auf die Rektaltemperatur von zutraulichen und ängstlichen männlichen Nerzen
Author(s) -
Korhonen H.,
Hansen S. W.,
Malmkvist J.,
Houbak B.
Publication year - 2000
Publication title -
journal of animal breeding and genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.689
H-Index - 51
eISSN - 1439-0388
pISSN - 0931-2668
DOI - 10.1046/j.1439-0388.2000.00256.x
Subject(s) - mink , temperament , juvenile , trap (plumbing) , american mink , zoology , rectal temperature , psychology , biology , ecology , personality , social psychology , physics , meteorology
The objective was to compare response levels of stress‐induced hyperthermia (SIH) in male mink from confident and fearful breeding lines. In experiment 1, effects of capture by trap, immobilization and recapture by trap were compared (n = 20 juvenile males per group). Experiment 2 clarified of how capture by trap and repeated temperature measurements in the tight trap position affected SIH response (n = 9 males, aged 1–2 years per group). In experiment 3, effects of capture by hand and short‐term handling in arms on rectal temperatures were evaluated (n = 11 juvenile males per group). Hyperthermic response in the mink was fast. Furthermore, treatments such as capture, recapture, immobilization in a trap and handling in arms were found to evoke measurable temperature responses. After first capture, no significant differences in SIH response between animals of different temperament lines were noted. However, fearful and confident animals tended to react differently to trap immobilization; the fearful ones by increasing or maintaining their response levels, and confident ones by decreasing them. SIH response to recapture by trap was opposite in the temperament groups; after recapture SIH was significantly higher and lower in fearful and confident animals compared with the first capture, respectively. It is concluded that systematic temperament selection has led to significant differences in stress responses between animals selected for confident and timid behaviour. Higher stress reactivity in animals from a fearful temperament line is the most plausible explanation for the lower breeding success observed in previous studies.