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Extreme temp = sick calves
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<blockquote data-quote="gcreekrch" data-source="post: 1472491" data-attributes="member: 14161"><p>You are getting it. Kinda like car insurance, we only need it if we have a problem..........</p><p></p><p>I do wonder in Oz, if part of the reason your powers that be are reluctant to approve the live vaccine is because of the extended and in some cases the non exsistant actual calving season in a big part of your country. I have had enough young folks here tell me a lot of the management on the big stations there and it doesn't surprise me why. </p><p>If operators started using the MLV on herds that have never been protected it would be an abortion nightmare for the pregnant cows unless they could be effectively sorted away from the vaccinated opens until their turn to calve came about.</p><p>I am meandering some here but hope you catch my drift. You think that line of thought has merit?</p><p></p><p>The last thing the drug companies want on their hands is a wreck.</p><p>I think this better explains what I am trying to get across but not as fully as the Doc would explain.</p><p></p><p>Etiology:</p><p>Bovine viral diarrhea virus is an RNA virus of the Pestivirus genus. The most important reservoir of infection in cattle is the presence of persistently infected (PI) cattle. If a susceptible pregnant cow becomes infected with BVD during the first trimester of her pregnancy (between 42 and 125 days), the fetus can become infected with BVD and the result is the birth of a persistently infected (PI) calf. This animal will carry the virus for life, shed high levels of BVD virus from all body orifices and its body will not mount an immune response to the virus because it is immunotolerant. Often PI animals are sickly since the infection can impair their normal immune function, but some survive and become lactating cows. This is problematic for two reasons; they go on to produce PI calves and they serve as a reservoir of infection in the herd. The other source of BVD within a herd is acutely infected cattle. Animals with acute, transient infections can spread BVD to other cattle, but they shed virus at a much lower level and for a shorter period of time than PI animals. This type of horizontal transmission of BVD occurs between cattle in close contact when susceptible cattle are directly exposed to infectious secretions. Veterinarians, farm workers and equipment contaminated with BVD virus can also serve as fomites and spread the disease. Finally, BVD can be spread via infected semen and embryo transfer, but this is rather uncommon and the primary source of infection remains PI cattle.</p></blockquote><p></p>
[QUOTE="gcreekrch, post: 1472491, member: 14161"] You are getting it. Kinda like car insurance, we only need it if we have a problem.......... I do wonder in Oz, if part of the reason your powers that be are reluctant to approve the live vaccine is because of the extended and in some cases the non exsistant actual calving season in a big part of your country. I have had enough young folks here tell me a lot of the management on the big stations there and it doesn't surprise me why. If operators started using the MLV on herds that have never been protected it would be an abortion nightmare for the pregnant cows unless they could be effectively sorted away from the vaccinated opens until their turn to calve came about. I am meandering some here but hope you catch my drift. You think that line of thought has merit? The last thing the drug companies want on their hands is a wreck. I think this better explains what I am trying to get across but not as fully as the Doc would explain. Etiology: Bovine viral diarrhea virus is an RNA virus of the Pestivirus genus. The most important reservoir of infection in cattle is the presence of persistently infected (PI) cattle. If a susceptible pregnant cow becomes infected with BVD during the first trimester of her pregnancy (between 42 and 125 days), the fetus can become infected with BVD and the result is the birth of a persistently infected (PI) calf. This animal will carry the virus for life, shed high levels of BVD virus from all body orifices and its body will not mount an immune response to the virus because it is immunotolerant. Often PI animals are sickly since the infection can impair their normal immune function, but some survive and become lactating cows. This is problematic for two reasons; they go on to produce PI calves and they serve as a reservoir of infection in the herd. The other source of BVD within a herd is acutely infected cattle. Animals with acute, transient infections can spread BVD to other cattle, but they shed virus at a much lower level and for a shorter period of time than PI animals. This type of horizontal transmission of BVD occurs between cattle in close contact when susceptible cattle are directly exposed to infectious secretions. Veterinarians, farm workers and equipment contaminated with BVD virus can also serve as fomites and spread the disease. Finally, BVD can be spread via infected semen and embryo transfer, but this is rather uncommon and the primary source of infection remains PI cattle. [/QUOTE]
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