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Proceedings of the 10th International Colloquium on Paratuberculosis

Proceedings of the 10th International Colloquium on Paratuberculosis

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#106 A gap in <str<strong>on</strong>g>the</str<strong>on</strong>g> bio security fence. Bought in beef bulls in dairy herds in Ireland (2004-2008)<br />

Peter C. Mullowney, Damien Barrett, Kevin Kenny, Richard Fall<strong>on</strong>, Martin Blake, Margaret Good, Department <str<strong>on</strong>g>of</str<strong>on</strong>g><br />

Agriculture, Ireland; Teagasc Beef Research Centre, Grange, Ireland<br />

Beef breeds are <str<strong>on</strong>g>of</str<strong>on</strong>g>ten used as bulls in dairy herds <strong>on</strong>ce a sufficient number <str<strong>on</strong>g>of</str<strong>on</strong>g> cows have been bred to dairy<br />

AI sires to ensure adequate supply <str<strong>on</strong>g>of</str<strong>on</strong>g> replacement dairy stock. The introducti<strong>on</strong> and use <str<strong>on</strong>g>of</str<strong>on</strong>g> such bulls curtails<br />

<str<strong>on</strong>g>the</str<strong>on</strong>g> potential genetic improvement <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> herd but it also leads to an increased bio-security risk especially when<br />

source herds are not participating in a disease m<strong>on</strong>itoring/c<strong>on</strong>trol programme. Diseases such as Johne’s disease<br />

may be introduced into dairy herds in this way.<br />

A total <str<strong>on</strong>g>of</str<strong>on</strong>g> 942,000 calves were born to dairy cows in 2008. 51% <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g>se had a dairy sire, 45% <str<strong>on</strong>g>of</str<strong>on</strong>g> which<br />

were by AI, and 49% a beef sire, 32% <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g>se by a stock bull.<br />

If a Johne’s c<strong>on</strong>trol programme in dairy herds is not extended to <str<strong>on</strong>g>the</str<strong>on</strong>g> producers <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g>se beef bulls <str<strong>on</strong>g>the</str<strong>on</strong>g>n<br />

<str<strong>on</strong>g>the</str<strong>on</strong>g>se bulls may be <str<strong>on</strong>g>the</str<strong>on</strong>g> vehicle for <str<strong>on</strong>g>the</str<strong>on</strong>g> organism to enter <str<strong>on</strong>g>the</str<strong>on</strong>g> dairy herd. While a c<strong>on</strong>trol programme would be<br />

much more difficult to implement in a beef herd due to <str<strong>on</strong>g>the</str<strong>on</strong>g> impossibility <str<strong>on</strong>g>of</str<strong>on</strong>g> separating calves from adult animals,<br />

a certified free programme in closed herds would be possible. A previous study <str<strong>on</strong>g>of</str<strong>on</strong>g> Irish beef herds had examined<br />

animal movements in to and out <str<strong>on</strong>g>of</str<strong>on</strong>g> case herds infected with Johne’s Disease (faecal positive) compared<br />

with c<strong>on</strong>trol herds that were not infected.(negative <strong>on</strong> a serum survey) [1]. In <str<strong>on</strong>g>the</str<strong>on</strong>g> current study a total <str<strong>on</strong>g>of</str<strong>on</strong>g> 478<br />

bulls were purchased by dairy herds from beef case herds, 96 <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g>se bulls subsequently moved to a sec<strong>on</strong>d<br />

herd. The average number <str<strong>on</strong>g>of</str<strong>on</strong>g> bulls sold from case herds was eleven. A total <str<strong>on</strong>g>of</str<strong>on</strong>g> 931 bulls were purchased by<br />

dairy herds from 167 <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> 277 beef c<strong>on</strong>trol herds, 176 <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g>se bulls subsequently moved <strong>on</strong>wards to o<str<strong>on</strong>g>the</str<strong>on</strong>g>r<br />

herds. The average number <str<strong>on</strong>g>of</str<strong>on</strong>g> bulls sold from c<strong>on</strong>trol herds was seven.<br />

[1] Mullowney,P.C., Barrett,D., Egan,J., Fall<strong>on</strong>,R., Blake,M., Good,M ;Cattle movements in to and out <str<strong>on</strong>g>of</str<strong>on</strong>g><br />

Johne’s infected beef suckler herds in Ireland. <str<strong>on</strong>g>Proceedings</str<strong>on</strong>g> 9th <str<strong>on</strong>g>Internati<strong>on</strong>al</str<strong>on</strong>g> <str<strong>on</strong>g>Colloquium</str<strong>on</strong>g> <strong>on</strong> <strong>Paratuberculosis</strong>,<br />

Tsukuba, Japan, 29 October – 2 November 2007.<br />

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