Diseases of domesticated birds (1920) Diseases of domesticated birds diseasesofdomest00ward Year: 1920 318 DISEASES OE DOMESTICATED BIKDS POSITION OF HAND AND KNIFE Figure 67 shows the position of a chicken ready for killing and held by the feet in a U-shaped shackle. Notice that the thumb of the killer is pressed finnly down on the head just below and behind Fig. 67. Correct grasp of head at angle of jaw and position of small knife when cutting vein. (Pennington and Betts) the ear in the space to which attention was called when discussing the bones of the skull. Here, too, is the hinge o
Diseases of domesticated birds (1920) Diseases of domesticated birds diseasesofdomest00ward Year: 1920 318 DISEASES OE DOMESTICATED BIKDS POSITION OF HAND AND KNIFE Figure 67 shows the position of a chicken ready for killing and held by the feet in a U-shaped shackle. Notice that the thumb of the killer is pressed finnly down on the head just below and behind Fig. 67. Correct grasp of head at angle of jaw and position of small knife when cutting vein. (Pennington and Betts) the ear in the space to which attention was called when discussing the bones of the skull. Here, too, is the hinge of the jaw. Pressure of the thumb on one side of this portion of the skull and on the other side at the same place with the forefinger, or with the forefinger and second finger, will result in opening the chicken's mouth and holding it open while the operator makes the cut to bleed. Held in such fashion, there is nothing to constrict the blood vessels, thereby pre- venting the blood from escaping even though these vessels be cut. The pressure against the jaw makes accurate cutting of the veins easier, since the bird can not close its mouth until the pressure is removed. Of course, care must be taken not to stretch the neck unduly, else the vessels will be pulled to such a narrow diameter that they are more difficult to find and also more difficult to empty. The position of the knife in the mouth, which is shown by the dotted line, needs no further explanation. The knife itself, how- ever, is very different from that ordinarily used in the bleeding of
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