Читать книгу Bovine Reproduction - Группа авторов - Страница 277

Infusion of local anesthetic into the incision site or a line block may be used to desensitize a selected area of the paralumbar fossa. An 18‐gauge, 3.8‐cm needle is used to infuse multiple injections of 10 ml of local anesthetic solution subcutaneously and into the deep muscle layers and peritoneum. Pain of successive injections may be alleviated by placing the edge of the needle into the edge of the previously desensitized area at an angle of approximately 20–30° [2]. In heavily muscled or overweight cattle, it may be necessary to use an 18‐gauge, 7.5‐cm needle to penetrate through the large amount of subcutaneous fat to reach the deep muscle layers. The amount of local anesthetic needed to acquire adequate anesthesia depends on the size of the area to be desensitized. Adult cattle weighing 450 kg can safely tolerate 250 ml of a 2% lidocaine hydrochloride solution [2]. Delayed healing of the incision site is a possible complication of infiltration of local anesthetic at the surgical site.