Macrae A I, Barnes D F, Hunter H A A, Sargison N D, Scott P R, Blissitt K J, Booth T M, Pirie R S
Department of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush Veterinary Centre, Roslin, Midlothian EH25 9RG.
Vet Rec. 2003 Oct 18;153(16):489-92. doi: 10.1136/vr.153.16.489.
The administration of intraruminal identification boluses to a group of 76 lambs resulted in 24 (32 per cent) showing signs of pharyngeal damage. In 16 of them the bolus was found to be in the retropharyngeal region by means of a hand-held microchip scanner, radiography and endoscopy. Purulent tracts were identified in the dorsal pharynx. In 13 of the 16 lambs the surgical removal of the bolus under general anaesthesia was followed by a normal clinical recovery, although the lambs did not grow as well as similar unaffected animals; three of the 24 lambs died. The administration of a larger bolus to 10 yearling rams did not result in any clinical signs of pharyngeal damage. The most important factors influencing the occurrence of this type of injury among this group of lambs were the size and age of the lambs, the positioning of the lambs during bolus administration, the relative size of the dosing gun and bolus, and the large number of animals in the group.
给一组76只羔羊投喂瘤胃内识别丸剂，结果有24只（32%）出现咽部损伤迹象。通过手持式微芯片扫描仪、X光摄影和内窥镜检查，在其中16只羔羊的咽后区域发现了丸剂。在背侧咽部发现了化脓性管道。16只羔羊中有13只在全身麻醉下手术取出丸剂后临床恢复正常，尽管这些羔羊的生长情况不如未受影响的同类动物；24只羔羊中有3只死亡。给10只一岁公羊投喂较大的丸剂未导致任何咽部损伤的临床症状。影响这群羔羊中此类损伤发生的最重要因素是羔羊的大小和年龄、投喂丸剂时羔羊的体位、投药枪和丸剂的相对大小以及群体中动物的数量。
