Changes

The vast majority of work (76%) was done using outbred Sprague-Dawley or Wistar rats.  Inbred strains were used on only 12% of occasions.  Of the inbred strains, the most widely used was F344 (32.1%), followed by LEW (22.5%).  Mutants (=transgenic) were used only in 1% of the studies, reflecting the circumstances explained below.

The vast majority of work (76%) was done using outbred Sprague-Dawley or Wistar rats.  Inbred strains were used on only 12% of occasions.  Of the inbred strains, the most widely used was F344 (32.1%), followed by LEW (22.5%).  Mutants (=transgenic) were used only in 1% of the studies, reflecting the circumstances explained below.

[[Image:Rat usage picture.jpg|thumb|right|300px|'''Figure 1:''' ''Usage of different rat types in research articles from 2001 to 2005'' <br> Krinke, George J. (2000)]]

[[Image:Rat usage picture.jpg|thumb|right|200px|'''Figure 1:''' ''Usage of different rat types in research articles from 2001 to 2005'' <br> Krinke, George J. (2000)]]

====Stocks (~outbred strains)====

====Stocks (~outbred strains)====

:* '''''Long-Evans:'''''  Multipurpose model organism (frequent in behavioral and obesity research).  Developed by crossing Wistar females with a wild gray male.  They are white with a black or brown hood (=head and shoulders).

:* '''''Long-Evans:'''''  Multipurpose model organism (frequent in behavioral and obesity research).  Developed by crossing Wistar females with a wild gray male.  They are white with a black or brown hood (=head and shoulders).

[[Image:Inbred_rat_lines.jpg|thumb|300px|'''Zucker Rat''' <br> Joanna Servaes 2006, WikiMedia Commons]]

[[Image:Inbred_rat_lines.jpg|thumb|200px|'''Zucker Rat''' <br> Joanna Servaes 2006, WikiMedia Commons]]

====Strains (~inbred strains)====

====Strains (~inbred strains)====