Does continuous activation of the BNST induce the onset of pasive phase behavior?

Abstract

<p>The guinea pig, Cavia Porcellus, is a useful research model in early developmental studies because, like humans, they have a protracted gestation, possible complications during pregnancy such as toxemia, have similar placentation, and require vitamin C supplementation. Although, both Hartley and IAF guinea pigs have been used in research for over 30 years, very little information is available about the behavior of the IAF strain. In order to bridge this gap, behavior of IAF hairless (n=10) and Hartley (n=10) guinea pigs was observed in both home cage and open field enriched environments. Home cages were standard (76cm X 56cm) polycarbonate housing lined with TEK-Fresh paper bedding. Ad libitum access to water and Teklad-7006 guinea pig pellets was provided. Hartley and IAF strains were housed separately in groups of 2-3 for the home cage observation. However, guinea pigs were grouped as a herd (n=10) in the open field arena. The arena (70cm X 140cm) was lined with fleece, and water made available. For environmental enrichment, wooden blocks were distributed throughout the arena, and access to Western Timothy hay (Phleum pratense L.) provided. Both the open field and home cage behaviors were recorded for 1 hour each in 1080p and scored using JWatcher video software. The most predominant behavior observed for both strains was consumption of hay and water. However, numerous social explorations were also observed including nose to nose contact and following, with very few instances of aggressive behavior. More importantly, analyses revealed higher levels of social interaction and physical activity in the open field than in the home cage environment, suggesting the open field may be providing increased opportunities for exercise and overall enrichment. Future studies are needed to determine the exact long-term benefits of an open field arena as environmental enrichment for laboratory guinea pigs.</p><p>This presentation occurred at the Wright State University Campus-Wide Celebration of Research, Scholarship and Creative Activities on April 8, 2011</p>