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Long Range Dewormer?
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<blockquote data-quote="Lucky_P" data-source="post: 1647809" data-attributes="member: 12607"><p>No.</p><p>Dairy cattle... milk residues are the concern. Essentially, every gallon of milk produced every day for 5 months(or more) would have violative residues of eprinomectin in it, if you used it in lactating dairy cows.</p><p>Feedlot cattle - I suspect tissue residues are, once again, the concern. Depending upon how long the cattle are on feed, it may be less than the 5-month duration of action claimed by BI for parasite control... but tissue residues may persist well beyond that 5-month mark, so even if cattle are on feed for 5 months or longer before slaughter, violative tissue residues might still be present. (On that point, if you're using it in a cow-calf setting, and decide to cull a cow or heifer... you may get smacked for tissue residues if she goes to slaughter)</p><p></p><p>Management-intensive grazing... I'm just postulating here... in those settings (as was the case here) you're moving cattle to a fresh paddock daily (or multiple times daily, or at least every couple of days)... and, each time they move, they're 'seeding' a fresh new paddock with parasite eggs selected for resistance to that class of dewormers. No chance for 'dilution' by refugia... which pretty well gets hammered anyway, if you follow the outdated practice of deworming everything in the herd at one time.</p><p></p><p>PBAngusOkie asked... and I'll tell you to consult your own veterinarian, but I know from experience, that many of my colleagues are not staying up-to-date on some issues... I know I had a hard time staying current when I was in practice. For instance, I lay a lot of the blame for widespread anthelminthic resistance we see in small ruminant nematode parasites at the foot of veterinarians who recommended (improper) rotation of dewormers. Did they do it on purpose? No, but changing to a different dewormer, or even worse - a different class of dewormers - every time you deworm, and deworming every animal in the flock... was a disaster. We're seeing that same resistance deal play out in cattle now... only major difference is, nematodes don't typically 'kill' cattle... but they'll sure kill the he!! out of goats and sheep.</p><p></p><p>Caveat: This is only for nematode parasites... liver flukes are a whole 'nother ball game:</p><p>I only deworm calves, yearlings, and first-calf heifers. Anything over 2.5-3 yrs needs to leave if she's got issues with parasites. Adult cows should and do develop immunity/tolerance to 'worms', and they are extremely important as the source of 'refugia' - the population of worms on a premise that's not under selection for resistance to dewormers. </p><p>Targeted/strategic deworming is desirable; timetable will vary depending upon your location... Here in KY, the best time to deworm is July... it's typically hot and dry for the next several months... worm eggs largely lie dormant, or larvae that hatch die more rapidly due to heat and dessication, allowing those calves/yearlings to gain more growth and immunologic response capabilities before being exposed to new 'waves' of infectious larvae when fall rains arrive.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1647809, member: 12607"] No. Dairy cattle... milk residues are the concern. Essentially, every gallon of milk produced every day for 5 months(or more) would have violative residues of eprinomectin in it, if you used it in lactating dairy cows. Feedlot cattle - I suspect tissue residues are, once again, the concern. Depending upon how long the cattle are on feed, it may be less than the 5-month duration of action claimed by BI for parasite control... but tissue residues may persist well beyond that 5-month mark, so even if cattle are on feed for 5 months or longer before slaughter, violative tissue residues might still be present. (On that point, if you're using it in a cow-calf setting, and decide to cull a cow or heifer... you may get smacked for tissue residues if she goes to slaughter) Management-intensive grazing... I'm just postulating here... in those settings (as was the case here) you're moving cattle to a fresh paddock daily (or multiple times daily, or at least every couple of days)... and, each time they move, they're 'seeding' a fresh new paddock with parasite eggs selected for resistance to that class of dewormers. No chance for 'dilution' by refugia... which pretty well gets hammered anyway, if you follow the outdated practice of deworming everything in the herd at one time. PBAngusOkie asked... and I'll tell you to consult your own veterinarian, but I know from experience, that many of my colleagues are not staying up-to-date on some issues... I know I had a hard time staying current when I was in practice. For instance, I lay a lot of the blame for widespread anthelminthic resistance we see in small ruminant nematode parasites at the foot of veterinarians who recommended (improper) rotation of dewormers. Did they do it on purpose? No, but changing to a different dewormer, or even worse - a different class of dewormers - every time you deworm, and deworming every animal in the flock... was a disaster. We're seeing that same resistance deal play out in cattle now... only major difference is, nematodes don't typically 'kill' cattle... but they'll sure kill the he!! out of goats and sheep. Caveat: This is only for nematode parasites... liver flukes are a whole 'nother ball game: I only deworm calves, yearlings, and first-calf heifers. Anything over 2.5-3 yrs needs to leave if she's got issues with parasites. Adult cows should and do develop immunity/tolerance to 'worms', and they are extremely important as the source of 'refugia' - the population of worms on a premise that's not under selection for resistance to dewormers. Targeted/strategic deworming is desirable; timetable will vary depending upon your location... Here in KY, the best time to deworm is July... it's typically hot and dry for the next several months... worm eggs largely lie dormant, or larvae that hatch die more rapidly due to heat and dessication, allowing those calves/yearlings to gain more growth and immunologic response capabilities before being exposed to new 'waves' of infectious larvae when fall rains arrive. [/QUOTE]
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