WEBVTT
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Welcome to the Poultry Keepers Podcast, where we give you the information you need to succeed.
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In this episode Carey Blackmon and Jeff Mattocks continue their Poultry Health Master Class with Part three.
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So, let's jump right in and begin this discussion with Mereks Disease.
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Let's just start with probably the most controversial poultry disease
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out there.
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Which one?
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Which one are there?
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Okay.
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See to you, there's only like, okay, so we,
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we covered co acidosis last time, which is one of the ones.
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So let's talk about Mareks
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That's pretty much everywhere and yeah, they won't admit that it's vertically transmitted.
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Yeah, I mean,
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anyway, yeah, go ahead.
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So where do you want, where do you want to go with that?
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Alright, so there's I and body Ways to Tell, but first all, what, what is merits?
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It is a virus that affects primarily the nervous system and the nerves and the bird, right.
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It, it causes nerves to shut down and it, you know, um, it'll give you tumor looking growth.
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And, but yeah, I mean, it's a, I didn't say what you're looking for.
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I'm sure I didn't, but it's a, it's a neurological, you know.
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So do they have like a, a twitch?
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I've never seen a twitch.
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How do you, how do you know?
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How do you know
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when they have it?
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Well, some people go by the eye and there's a couple forms of merricks, right?
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So they don't always display the same, right?
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I cannot personally tell you that I have seen a 100% conclusive that I have seen a.
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The ocular observation, right?
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So in, in my line of work doing necropsies, I always verify it with either enlarged, uh, nerves.
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Usually the easy one to get to is the sciatic nerve and the leg, right?
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Um, and often, you know, you'll see a bird that is laying over a lame, um, with one leg paralyzed, usually one leg.
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Right.
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I mean, really severe.
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They usually don't live long enough to have both legs paralyzed, but Hmm.
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Okay.
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Okay.
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Normally I'll see one, you know, with, um, and I don't know why, but it, it seems to affect the right leg first in, in the cases that I've seen personally.
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Right.
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It, it, it appears to be the right leg, you know, for the bird.
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So, okay.
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So
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maybe it's, maybe it starts in their left brain.
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I don't know.
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Uh, dunno.
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So, yeah, and like when I do the necropsy, you know, um, you know, I'll just go right to that leg.
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You know, if, if, if the bird was alive and I dispatched it right then I'll go right to that leg, I'll go to that right leg.
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Mm-hmm.
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Um,
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and I'll open that skin up and then I use something, um, dull, like, uh, something like a tongue depressor.
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Or I don't use a knife, right?
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'cause I don't wanna, and I'll pull the muscles apart, layer by layer.
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What if you had a butter knife?
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That would work.
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That would work.
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Okay.
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Most butter knives will work.
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So I pullet apart, you know, each muscle.
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I pullet back right?
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One at a time.
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I'm separating the muscles, working my way down to the bone.
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'cause the sciatic nerve lays down there.
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Just, just, you know, next to the bone.
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And I'm looking for that.
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Um, it's pretty easy to see, you know, it's a thick white string.
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Um, it, it, when it, when it's healthy, it'll be kind of a milky white.
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It'll be semi translucent, milky white, not a bright white.
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Mm-hmm.
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Um, okay.
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In.
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So I've seen it display two different ways.
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One was, uh, so I've seen perpendicular rings around that nerve, right?
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Looked really weird, you know, like, I don't know the right term.
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Um, striations, if you will, something like that.
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Uh, it's generally enlarged.
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It'll be twice.
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Its eyes are bigger.
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But I've also seen, I've also seen the brown, reddish brown tumor growing on that nerve.
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So that's in the bird with leg paralysis.
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Now when I see the bird that just sits there all hunched up, um, looking like it's sleeping, doesn't want to move, that sort of thing when I've done the knee, yeah, those birds, I'll find the tumor inside the body, cavity along the spine.
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So, and those are almost always, um, you know, that dark, reddish, brown, you know, um, tumor growing and they're somewhat attached to that spine.
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Right.
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And they're working on that main spinal cord.
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Mm-hmm.
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But, um, those are the two ways that I've seen it more.
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Like in a meat bird, I'll see it in the leg, usually first, and then hands, um.
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You know, I would see it more in the back.
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Now.
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I, I've seen two or three odds tumors all
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over the place.
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Huh?
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In meat birds, you never know where you're gonna see a tumor with them.
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Not
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really,
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you know, I rarely see a whole lot of tumors in there.
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Occasionally I've seen liver tumors, but they're, they're rare.
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Um, but, you know, in, in like our birds, I would.
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I would think it also depends on kind of on age, when you're seeing Mareks at younger ages, like 14, 16 weeks, I think you're gonna see it in the leg.
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And then if you're talking about birds that are 2, 3, 4 years old, I think you're gonna probably see the tumors up inside the body cavity along the spine.
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Right.
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Um, now let me ask this.
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If you see it in a 12 week old chicken.
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What are the chances that that chicken's mother has it and it's suppressed?
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Okay.
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So a dormant, whatever you wanna call it.
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Okay.
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So scientifically speaking.
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Mm-hmm.
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Right.
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According to all of academia out there, marck is not transmissible through the egg, so it's not vertical, um, in a flock.
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Yeah.
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I personally, this is only my personal beliefs, so don't shoot me, but I, I disagree because it is, it, it appears to be everywhere, right?
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Um, I don't know.
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I, I don't know if I've honestly seen a flock that I would tell you is a hundred percent, you know, merricks free.
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Um, it, it just seems to be, it, it is so prevalent in the poultry world that I, I.
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I, so,
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so about a year ago, you and I got to go to a farm together and, and do look at it and check some things out for'em.
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And, um, they had a whole boatload of chickens that just itched signs of merricks.
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Yep.
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But I mean, they were, they were all still laying.
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I, I don't usually see a huge depression in egg production.
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I mean, you know, 10 to 20%, like the average, like this, the, the average small flock owner would not notice that, right.
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So, yeah.
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You know, if they've got 12 hands and they're getting eight eggs a day.
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They think they're doing pretty good, right?
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Right.
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When they probably should be getting 10 eggs or more a day.
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Um, so people aren't gonna miss necessarily 20%.
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Yeah.
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And that's typically what I see.
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So on the egg laying side, I, I don't see it.
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Um,
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um, you know, I don't see it being, you know, uh, affecting total eggs laid.
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So, yeah, so I sue, I get it.
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It's a virus and it, you know, it has to be, I, that's what everything science says, right?
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Um, I, I get it.
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But you know, like Mycoplasm and some of those are transferrable through the egg and they're also virus.
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So I, I don't know.
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I'm not, I'm just, I just shared my personal belief that I think it is passed, but, um, they're never gonna be,
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I can tell you what I've seen.
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Um, I was able to get access to research gait because my wife was doing some research while she was, um, finishing up her doctorate and no, I don't call her Dr.
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Blackman on a regular basis.
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I do have her get a really funny look when I do, but, so I started reading about it.
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From what I can see, the reason why they say that is because they have taken eggs from hens that know they knew they had merricks to a completely separate facility, sanitized the eggs, put them in a sanitized incubator, and they did not have merits when they came out.
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I guess they drew blood, I don't know.
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But within.
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One study was two weeks of being put back with a mother.
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They have it, so that's why they say it's not in the egg, but I'm like you, like in the real world where we live and have chickens, when that chick pops out, it's got merits because it's exposed to it from the mom.
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You would think so, unless whether it
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came through or not.
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Well,
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I mean, if it, it is everybody sanitizing their eggs before they go in the incubator, right?
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Well, no, not everybody.
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And then, I mean, I've had people tell me that I was ridiculous and that that was the dumbest thing that I should ever do, that I should leave the bloom on it.
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Well, I mean, I'm sanitizing the freaking thing.
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Yeah.
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And you know.
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It, it could take a stressor to activate
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it.
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Well, okay, so Sue is spot on with this, right?
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Yep.
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So again, correlating with my experience only, right?
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I don't see Merricks in really high end managed flocks that that.
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You know, are living basically without stress.
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Right?
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Very harmonious.
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You know, life is good.
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Um, you know, they got good living conditions, they got good living quarters, all that.
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So yeah, I, uh, I agree.
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You know, it, it takes a stress factor to Yeah.
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Make it flare up or show up.
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Uh, and I think it's hidden in, you know, unfortunately I think it's hidden in a lot of our flocks that, you know, one time.
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One time I told somebody, I was like, if your bird has that, it's a management issue.
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It's not.
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It is not.
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Anything else.
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You done pissed him off.
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Look man, hey, you know, I was, you know how sometimes you're just in that, in that mood where today's not the day and I'm sorry, but if you ask me a question, it won't be sugarcoated, but I will give you the a truthful answer like I will any other day.
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Oh, well, they caught me on that day and I'm like, look, you're, you're not like
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that.
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Come on,
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you're good at sugarcoating.
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You know, if I'm in the right mood and I care.
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But like, so I, there's all the controversy around this and I've spent some time with a friend of mine who is a poultry doctor.
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Like this person teaches at a university.
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Has studied poultry for like 30 years, and she explained to me the easiest way to explain it is it's like the herpes virus.
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It can be dormant.
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You can have a normal life.
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Everything's fine and dandy.
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You get a stressor, you start seeing symptoms, the stressor goes away.
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You may or may not continue to see symptoms like it's just a thing.
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Yeah.
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And I was like, okay, I can never thought about it like that, but Makes
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sense.
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All of your viral diseases.
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Right.
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Um, you know, like your new castles, your Mars, all of your viral diseases will, will kind of live in a hidden place mm-hmm.
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Within the body.
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And given, uh, the right stressful conditions, it'll flare up.
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You know, like
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I've had flocks with Newcastle's disease and every time we'd get a major snowstorm or you know, a bunch of rain thunderstorms, things like that, anything that kind of stressed the bird out.
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Mm-hmm.
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We'd see a flare up, we'd have mor a spike in mortality and a decrease in egg delay.
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And then, you know, after a week or so, it goes right back down again.
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Right.
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So again, I recently
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had a problem like that at my place.
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Um, I had some coyotes, which they're in the woods, but I had some get really close within a hundred yards.
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And, um.
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The, my dogs got ahold of one, one night and a couple nights later.
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There may have been a night scope involved.
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I'm not sure.
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I, I, there, it was a huge problem and that I, I had a bird that like, I don't know if it had a heart attack or what, but it just popped over.
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I opened it up, no issues, which, I mean, if I hadn't have found it that way, I would've probably ate it.
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That's how good it looked on the inside.
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But egg production has went to crap, so yeah, they thought coyotes were gonna get'em, so that was a stressor.
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And you know, the egg production went down and everything else, so.
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Yep.
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Yeah.
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And
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you know, they, they're like any other creature, stress is going to, you know, do do serious things to'em.
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Right.
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Just same as you or I.
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So it's, it's just, yeah.
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And, you know, and, and I've been to farms where people have, you know, overzealous, you know, border collies or yapping dogs and stuff like that, that don't live with the bird.
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Right, like, like your dogs stay out in the yard with the chickens all the time, so they're part of the normal environment.
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Mm-hmm.
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But you know, you know those infrequent visits.
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From a dog that they haven't seen before and gets really excited when it sees chicken, right?
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Thinking dinner.
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Um.
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Mm-hmm.
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You know, I, bad things happen.
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I, I've seen it from screaming toddlers.
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You know, people, people come visit, you know, somebody's chicken farm, you know, and they got two or three kids that, you know, uh, like to say everything at the top of their lungs and shriek and shrill and all that.
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They don't get out much.
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Chickens don't deal with that very well, right?
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No.
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So look, there's a lot of things that are stressful to'em that aren't to us, but you know, they're not us, so, yeah.