Bull Pre-Entry Testing and Disease Control

By Raymond Martinez,2014-04-07 21:11
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Bull Pre-Entry Testing and Disease Control

    Bull Pre-Entry Testing and Disease Control

    Our procedure for disease control in bulls coming on centre is based on:

    1. Avoiding bringing disease on to our centre and infecting other stock 2. Ensuring semen produced does not spread disease

    3. Protecting your bull from infection derived from other stock

    Dealing with the diseases in turn:

    ; BVD we test the bull to ensure it is not a carrier (PI). PI bulls are highly

    infectious to other stock and through semen. Once established as not PI

    we require the bull be vaccinated to prevent it becoming transiently

    infected (TI). The vaccine we require is Bovilis BVD. It needs to be done

    prior to entry and boosted 3-4 weeks later.

    ; EBL very few herds are positive in NZ but there are some this reliable

    test ensures your bull is clear.

    ; Johnes Disease widespread in NZ this test helps ensure the bull is not

    a risk to our centre and through semen.

    ; IBR bovine herpesvirus is very widespread in NZ with up to 50% of adult

    bulls infected. We take positive bulls on centre but keep them isolated

    from negatives.

    ; Leptospirosis the blood test for Lepto helps identify recent infections.

    As further precautions we also require vaccination (and booster 3-4 weeks

    later) and we routinely treat the bull with antibiotics on arrival to the centre. ; Campylobacter and Trichomonas venereal diseases of bulls causing

    infertility in cows bulls are tested 21 days after arrival while still in


    ; Brucella abortus NZ is free of Brucella but due to it’s severe

    implications for the cattle industry and exports we test bulls prior to entry. ; Tuberculosis TB cards must accompany bulls coming and going from

    the centre. This and our pre-entry certificate confirm the farm of origin

    status does not present a risk. Further to this we TB test bulls prior to


    ; Clostridial Diseases several risk factors for clostridial diseae are

    heightened as a bull is trucked to the centre and fed well prior to collecting

    semen. A highly effective vaccination all but eliminates this risk.

    Covexin 10 is the vaccine of choice as it includes Clostridium sordellii. It

    needs a booster 3-4 weeks later.

; Salmonella incl. Brandenburg risk factors increase with trucking etc

    vaccine and booster provides effective protection.

    ; Parasites internal and external parasites are controlled with an

    endectocide given prior to entry.

    Clinical Examination

    We require a veterinary examination to detect other diseases not

    detectable with the routine regime. The vet also warrants the completion

    of the procedures and will detect injury or condition which will make the

    bull unlikely to produce good semen.

    Isolation on Farm

    We require the bull to be isolated on farm for 30 days before coming onto

    the centre. This is to ensure that, while it might test clear for disease

    prior to entry, that it does not contact other diseased animals in the

    meantime and come down with the condition.

    Isolation on Centre

    We isolate the bull for 30 days on centre as an added precaution. We

    retest the bull in that period

    Vaccination Packs

    A common difficulty clients convey to us is that vaccinating 1 or 2 bulls

    with 4 vaccines is a logistical issue for them and / or their vet. In the past

    we have had to vaccinate some bulls after arrival which defeats the

    purpose. To overcome this we are offering to send out a vaccine pack

    including a shot and a booster of the following vaccines:

    ; Bovilis BVD

    ; Lepto 3 3 serovars of leptospirosis

    ; Covexin 10 Clostridial vaccine

    ; Salvexin +B Salmonella

    Please ask about this option as you arrange to have the bull prepared to

    come on centre. There will be a charge to cover this.

    Pre-Entry Certificate

    This brings everything together. It is important that it is completed

    correctly and comes ahead of or with the bull. This must be signed by

    your vet. We also require the lab test results to accompany the certificate.

    Please note the lab test results on their own are not enough the

    certificate must be used.

    MAF Audits

    MAF audit our centre every 6 months. Compliance in general is getting

    tighter but it does have a positive effect of improving our standards of

    operation. It is important that we keep all the processes tidy to comply

    your assistance with this is appreciated

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