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<blockquote data-quote="Katpau" data-source="post: 1753623" data-attributes="member: 9933"><p>Thank you Wbvs58 for expanding on the BVD risk. I personally think it is a good idea to test every new cow you introduce into your herd, because you usually can't tell one is PI. It only costs a few dollars and could avoid the heartache of cows aborting, or creating more PI calves. Even a vaccinated cow has some potential of contracting BVD. She just won't get as sick and is very unlikely to die, but she could still abort or produce a PI calf. An animal that contracts BVD will normally recover and have no long term problems, but a calf exposed at a certain time in utero can appear healthy and yet carry and pass on the virus throughout their life. That is what we call a PI (persistently affected) animal. In addition, if you have a PI cow she will always have a PI calf. Here is some more information from a University paper:</p><p></p><p>"If pregnant animals recover, they may abort about 2 to 4 weeks after exposure, especially if they are in the second trimester of pregnancy. Those exposed in the first trimester may experience early embryonic death, while open cattle may fail to conceive and return to heat. Some cows, if exposed between approximately 60 and 120 days of pregnancy, may not lose their fetus, but rather may go on to deliver a persistently infected (PI) carrier calf. For the rest of its life this PI carrier calf will shed lots of BVD virus that can then infect other animals.</p><p>If a PI calf is in the herd, you may see signs indicative of BVD, including:"</p><p></p><p>Increased number of open cows</p><p>Delayed or strung-out calving periods</p><p>Abortions</p><p>Weak or dead calves at birth</p><p>Birth defects</p><p>Increased percentage of calves with sickness including scours, pneumonia and lameness</p><p>Runty calves or those doing poorly</p><p>Calves dying post weaning.</p></blockquote><p></p>
[QUOTE="Katpau, post: 1753623, member: 9933"] Thank you Wbvs58 for expanding on the BVD risk. I personally think it is a good idea to test every new cow you introduce into your herd, because you usually can't tell one is PI. It only costs a few dollars and could avoid the heartache of cows aborting, or creating more PI calves. Even a vaccinated cow has some potential of contracting BVD. She just won't get as sick and is very unlikely to die, but she could still abort or produce a PI calf. An animal that contracts BVD will normally recover and have no long term problems, but a calf exposed at a certain time in utero can appear healthy and yet carry and pass on the virus throughout their life. That is what we call a PI (persistently affected) animal. In addition, if you have a PI cow she will always have a PI calf. Here is some more information from a University paper: "If pregnant animals recover, they may abort about 2 to 4 weeks after exposure, especially if they are in the second trimester of pregnancy. Those exposed in the first trimester may experience early embryonic death, while open cattle may fail to conceive and return to heat. Some cows, if exposed between approximately 60 and 120 days of pregnancy, may not lose their fetus, but rather may go on to deliver a persistently infected (PI) carrier calf. For the rest of its life this PI carrier calf will shed lots of BVD virus that can then infect other animals. If a PI calf is in the herd, you may see signs indicative of BVD, including:" Increased number of open cows Delayed or strung-out calving periods Abortions Weak or dead calves at birth Birth defects Increased percentage of calves with sickness including scours, pneumonia and lameness Runty calves or those doing poorly Calves dying post weaning. [/QUOTE]
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