I plan to collect blood from guinea pig for several times, the only way i know is through cardic puncture, but i am not so well at this, and afraid that i may kill some of them during the experiment, so i would very thanks if anyone can share experience in this kind of animal.

If you kill a few but cardiac punctures.. ur technique will be perfected after loadz of frustrations and depression.....I know that feeling, indeed.... thou my lovely creatures are rats.. they kinda the same in cardiac i suppose....

Eyes are good.. but dunno what sort of experiment u r gonna perform.. my one invovles operations in the tummy.. so i cannot turn the animal and have to keep it recumbunt....and looking into their eyes are not bearable to every researcher......