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Cattle Boards
Breeding / Calving Issues
Cycling - Not Settling?
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<blockquote data-quote="Lucky_P" data-source="post: 1692228" data-attributes="member: 12607"><p>If the bull passes his BSE, then it's time to look at infectious diseases like Trichomoniasis and Leptospirosis(due to L. hardjo-bovis)... both of these can cause early embryonic death and return to heat. </p><p></p><p>Trichinosis is worthy of consideration if this is a 'used' bull... though, typically, what we see are cows that you thought were bred, then you see them back in heat 2-3 months after the bull served them - usually not coming back in every 18-21 days. Diagnosis will require PCR testing &/or culture of preputial washings/scrapings from the bull at the diagnostic laboratory.</p><p></p><p>Leptospira hardjo-bovis causes early embryonic death and repeated returns to heat on a fairly regular 18-21 day basis for 3-4 cycles or more before they finally 'stick'. L.hardjo-bovis is a cattle-adapted strain... dogs/coyotes, feral hogs, deer, other wildlife are not the culprits... carrier cattle in the herd are where you point the finger for this one. </p><p>Control... vaccinate appropriately with an 'HB' Lepto vaccine. In a tight spot, with small numbers of cattle, you could mass-treat with injectible oxytet... or... just vaccinate and then cull cows that didn't breed within the desired breeding period, then continue vaccinating against L.h-b as part of your normal herd health vaccination program - and vaccinate any retained heifers or purchased cows prior to breeding. Forever. </p><p>Mid- to late-term abortions due to Leptospirosis are generally due to infection with species other than Lepto. hardjo-bovis - and dogs/wildlife may be implicated as potential source of infection. </p><p>Serology for Lepto is not generally helpful with L. hardjo-bovis... whether infected or vaccinated - the cows don't mount much of an antibody reponse...they may have no or very low antibody titer to the L.hardjo antigen used in the serologic test. The 'HB' vaccines primarily induce cell-mediated immunity, not humoral(antibody) response. Definitive diagnosis would require PCR testing of urine from suspect cows... Lepto. hardjo-bovis colonizes the kidneys, so carrier animals are constantly shedding it in their urine. Vet can administer Lasix, collect urine sample, and submit to the diagnostic lab.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1692228, member: 12607"] If the bull passes his BSE, then it's time to look at infectious diseases like Trichomoniasis and Leptospirosis(due to L. hardjo-bovis)... both of these can cause early embryonic death and return to heat. Trichinosis is worthy of consideration if this is a 'used' bull... though, typically, what we see are cows that you thought were bred, then you see them back in heat 2-3 months after the bull served them - usually not coming back in every 18-21 days. Diagnosis will require PCR testing &/or culture of preputial washings/scrapings from the bull at the diagnostic laboratory. Leptospira hardjo-bovis causes early embryonic death and repeated returns to heat on a fairly regular 18-21 day basis for 3-4 cycles or more before they finally 'stick'. L.hardjo-bovis is a cattle-adapted strain... dogs/coyotes, feral hogs, deer, other wildlife are not the culprits... carrier cattle in the herd are where you point the finger for this one. Control... vaccinate appropriately with an 'HB' Lepto vaccine. In a tight spot, with small numbers of cattle, you could mass-treat with injectible oxytet... or... just vaccinate and then cull cows that didn't breed within the desired breeding period, then continue vaccinating against L.h-b as part of your normal herd health vaccination program - and vaccinate any retained heifers or purchased cows prior to breeding. Forever. Mid- to late-term abortions due to Leptospirosis are generally due to infection with species other than Lepto. hardjo-bovis - and dogs/wildlife may be implicated as potential source of infection. Serology for Lepto is not generally helpful with L. hardjo-bovis... whether infected or vaccinated - the cows don't mount much of an antibody reponse...they may have no or very low antibody titer to the L.hardjo antigen used in the serologic test. The 'HB' vaccines primarily induce cell-mediated immunity, not humoral(antibody) response. Definitive diagnosis would require PCR testing of urine from suspect cows... Lepto. hardjo-bovis colonizes the kidneys, so carrier animals are constantly shedding it in their urine. Vet can administer Lasix, collect urine sample, and submit to the diagnostic lab. [/QUOTE]
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