My horses are infested with lice. I can´t use the usual horse lice powder on them because most are pregnant. Horses can have two different kinds of lice, biting or chewing which feed on skin cells and sebaceous secretions, and sucking lice which feed on blood.
I worm my horses with ivermectin. Now, shouldn´t that take care of the sucking lice? And would a good fly spray with pyrethrin take care of the biting ones? Any suggestions would be greatly appreciated. I wonder how far apart I should do the two treatments? I suppose I should be talking to my vet about this.
if you search for the word "pregnant" you will turn up info stating it is safe in pregnant horses)
I would ask your vet about using ivermectin topically. It´s a common route and should take care of any type of lice used that way.
I really hate using fly spray, I hate to use any kind of insecticide anywhere on my place. Most of what I use is natural fly repellent, you know, herbal stuff. Unfortunately, none of it is strong enough to kill anything. So it would be great if I could use ivermectin topically.
If I´m not mistaken, the oral dosage is the same, whether it´s a guinea pig or a horse. (Lynx???) It´s just proportions that are different. Going by that, I´d say the topical dosage is the same too. Why not try it?
I´d stay away from sprays and powders, though.
But I am very interested in trying it topically. Can someone do the math for me, and figure out how much I would need to use on a 350 lb horse? And I suppose I would probably buy the ivomec?
at 0.5mg/kg that would come to 79mg of ivermectin.
Go to the feed store and get the topical kind (they call it "Pour-On"). I think it is diluted to 5mg/ml so it is weaker and you pour more on the horse rather than using the injectable (note: it´s all the same -- just more dilutant in the pour-on variety).
It is applied in a line down the animals back and it will work on lice where the oral may not. You might have noticed that in the reference info on the ivermectin page.
And to get that 79mg in the pour-on strength, I guess that´s about 16cc (79/5=~16)
Run through the numbers yourself so you understand everything thoroughly. Read the guineapig dosing information on the ivermectin page for a clear explanation.
- I GAVE, dammit!
If you can show me the math for how much to use per Kilo, I should be able to figure out each horse.
You need the weight of your animal in kilos. The pour-on dose is 0.5 mg/kg. The sheep drench you bought I think is .8mg/ml. So the idea is to figure out what the total dose is for the weight of horse you have and then determine what volume of drench will provide that dose.
It is poured in a line down the back -- head to tail. Since it is more diluted, your horse may be kind of oily but it will also serve to spread the ivermectin better.
If you can get the weight of your horse, we can figure it out. I´ll post it here so anyone can catch any math errors.
600 lb = 273 k @ 0.5 mg/kg dose is 136.5 mg
300 lb = 136 k @ 0.5 mg/kg dose is 68 mg
350 lb = 159 k @ 0.5 mg/kg dose is 79.5 mg
(Check your bottle -- I think it should be .8mg/ml -- I don´t have one to look at, but I think this is the rate)
To get 170.5mg you need to dose topically with 213 cc of the drench
To get 136.5 mg you need to dose topically with 171 cc of the drench
To get 68 mg you need to dose topically with 85 cc of the drench
To get 79.5 mg, you need to dose with 99 cc of the drench
If this looks too messy, you can return it and get the pour on. Since it would have 5mg/ml [1 cc = 1 ml], you would be applying much less. I think the price would be comparable but the pour-on just might be a bit cheaper as there isn´t as much dilutant as was used for the sheep drench. The other thing you could do if you wanted is to get the injectable that has 10mg/ml and dilute it 50/50 with propylene glycol which would essentially give you the proportions of the pour-on.
If you have any questions, you could read the ivermectin page to understand it more thoroughly.
I may keep this and use it for my pigs (although I wonder if I would ever use up 960 ml by the expiration date of may 2006) and get the Pour on for the horses.
The bottle you got (sheep drench) would have 768 mg of ivermectin and will treat 1536 kilos of animal topically @ 0.5mg/kg.
You have under a thousand kilos of horse -- but they may need two treatments to kill the eggs so you may actually need more ivermectin (if my figures are correct).