臺灣國際科展

Preventing Deer Tag Infections

科展類別
臺灣國際科展
屆次
2005年
科別
動物學
得獎情形
未得獎作品
學校名稱
Hamilton Boys High School
作者
Timothy Wade
關鍵字
Preventing Deer

摘要或動機

Farmers in many countries are legally required to identify livestock with some sort of tagging system. Tagging is required for ownership, breeding and as a means of tracking livestock during a disease outbreak.\r
New Zealand farmers are required to fit all livestock with two ear tags (one in each ear). Ear tags are applied in a similar way to the piercing of human ears. The two tags are of different sizes and are known as the primary and the secondary tags. The primary tag is physically bigger than the secondary tag.\r
We farm deer and have noticed that after tagging some deer develop ear infections at the site of tagging.\r
A randomized controlled trial was undertaken in 105 fawns to test the hypotheses:\r
‧ Pre treatment of the ear tag with liquid iodine will reduce post tagging infection.\r
‧ A reduction in ear infections as a result of tagging will lead to more rapid weight gain.\r
The treatment group had iodine applied to the sharp part of both primary and secondary tags immediately prior to tagging of the fawns. The control group was tagged in the usual fashion. Fawns were then assessed for infection at 6 and 11 weeks after tagging. Each ear was individually graded for infection and recorded against the number of the animal. Grading was on a scale of 0-3: zero having no infection; 1-slight redness; 2-a larger ring of redness and possibly some dried blood; 3-as for grade 2 plus swelling of the ear around the pin.


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