 A study by Marsh and Whaler ( 1984 ) reported a maximum yield of 9 @.@ 7 ml of wet venom , which translated to <unk> mg of dried venom . They attached " <unk> " clip electrodes to the angle of the open jaw of <unk> specimens ( length 133 – 136 cm , girth 23 – 25 cm , weight 1 @.@ 3 – 3 @.@ 4 kg ) , yielding 1 @.@ 3 – 7 @.@ 6 ml ( mean 4 @.@ 4 ml ) of venom . Two to three electrical bursts within a space of five seconds apart were enough to empty the venom glands . The Gaboon vipers used for the study were <unk> between seven and 11 times over a 12 @-@ month period , during which they remained in good health and the <unk> of their venom remained the same . 
