Animals that test positive either as a result of infection or vaccination are therefore excluded. Even where the antibodies can be shown by a later negative test to have been colostral in origin, potential sires may still not be selected due to the possibility of their being seronegative latent carriers. Potential AI sires In Ireland, beef bulls have traditionally been purchased by AI companies when they are between 8 and 20 months of age. However, with the increased use of genomics in beef herds, potential beef AI sires will increasingly be identified prior to birth, giving the greatest possible opportunity to manage the calf and its dam appropriately. IBR control in the herd and management of potential beef AI sires It is recommended that all herds address IBR control at herd level. This may require a vaccination programme. Further information on the management of IBR at herd level may be found in the Animal Health Ireland (AHI) leaflet- An information leaflet for Irish farmers, advisors and vets. http://online.pageflippdf.com/fitx/qlbc/ If you are vaccinating, do not vaccinate potential AI sires for IBR . Vaccinated animals will have IBR antibodies and will be excluded from AI stations.
Further steps to protect potential beef AI sires from IBR include: • Identify pregnancies that could produce a potential AI sire • Carry out a herd screening test to establish IBR status of the herd and dam(s) • Identify a source of IBR negative colostrum or a foster dam (if required) • Identify an isolation area for calving and calf rearing (if necessary)
For further details see: ‘A technical guide for veterinary practitioners and breeders of beef bull calves with potential for use as AI Sires’. http://online.pageflippdf.com/fitx/utkk/
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