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2017 ; 12
(9
): e0185135
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Assessment of housing density, space allocation and social hierarchy of
laboratory rats on behavioural measures of welfare
#MMPMID28926644
Barker TH
; George RP
; Howarth GS
; Whittaker AL
PLoS One
2017[]; 12
(9
): e0185135
PMID28926644
show ga
Minimum space allowances for laboratory rats are legislated based on weight and
stocking rates, with the understanding that increased housing density encourages
crowding stress. However, there is little evidence for these recommendations,
especially when considering positive welfare outcomes. This study consisted of
two experiments which investigated the effects of housing density (rats per
cage), space allocation (surface area per rat) and social rank (dominance
hierarchy) on the ability to perform simple behavioural tests. Male Sprague
Dawley (SD) rats (n = 64) were allocated to either high-density (n = 8) or
low-density (n = 8) cages. The second experiment investigated the effects of
surface area. SD rats (n = 40) were housed in dyads in either the large (n = 10)
or small (n = 10) cage. In both experiments, animals were tested on a judgment
bias paradigm, with their responses to an ambiguous stimulus being ascribed as
optimistic or pessimistic. Animals were also tested on open-field, novel-object
recognition and social-interaction tests. Recordings were taken from 1700-2100h
daily for rat observation and social rank establishment. Dominant animals
responded with significantly more optimistic decisions compared to subordinates
for both the housing density (p<0.001) and space allocation (p = 0.0015)
experiment. Dominant animals responded with increased social affiliative
behaviours in the social-interaction test, and spent more time in the centre of
the open-field test for both experiments. No significance was detected between
housing density or space allocation treatments. These findings suggest that
social rank is a significantly greater modifier of affective state than either
housing density or space allocation. This finding has not yet been reported and
suggests that future drafts of housing guidelines should consider animal social
status in addition to floor space requirements.