Further to the strike itself, we do need to focus on her other signs. Now her breathing rate is elevated and we'd be wary of an opportunistic respiratory infection potentially capitalizing on her compromised state. That said, since this didn't start until after the fly strike we cannot rule out at least some of this elevation and lack of energy being related to pain from the fly strike +/- related to metabolic acidosis due to the scours. In any case, we need to keep a close eye on this at this point.
Otherwise, we do need to address the scours for her as well (especially since it is the focus of the fly's targeting her. In regards ***** ***** this, I would suggest starting some broad spectrum care. To do so, we'd want to start her on Kaolin/Kaopectate. This is an anti-diarrheal that is OTC at most pharmacies (as a liquid) or farm supply stores (usually as a powder that you mix into water). This will help slow her loose feces and reduce her risk of further strike. Otherwise, we would want to also consider a broad spectrum antibiotic (ie Penicillin) to cover against bacterial causes for her scours. We may need to think about worming and fecal testing, but these would be our starting points here at this point.
Otherwise, I would just quickly note that we'd need to keep cleaning and topically treating (the Penicillin will help too) the wound to protect it from further strike or infection and facilitate healing.
Finally, we need to address her hydration since fluid losses from scours is often what makes them feel poorly. Now hopefully she is drinking, but if she isn't doing so well or has signs of dehydration (sticky gums, sunken eyes, or skin tenting), then we may need to start drenching electrolytes (ie Lectaid, Resorb, Pedialyte). In regards, ***** ***** much she will need at a time,this is going to be weight dependent. For example, for every 10 lb (5 kg) of body weight, she will need ¼ to ½ litres of fluid a day as normal maintenance fluid intake. Obviously, she will need more if there is scours associated, but this is a good start point. And she will need this divided up over 3+ feedings, so as not to over fill her stomach. If you haven't stomach tubed a lamb before, you can find some good guidelines ( LINK) or you can pop over HERE to see a video on how to pass esophageal feed a calf (these are not lamb specific links but it’s the same principal). You can usually find these feeders at your local feed store and they are quite useful to have on hand for cases like this.
Overall, while the fly strike is the urgent issue we need to address first, it is likely a side effect of a bigger issue. Therefore, we'd want to remove all maggots/eggs and treat the wound, but also start broad spectrum care to address her diarrhea and maintain her hydration. If we can do that, we'd hope to see her increased breathing rate settle either due to the discomfort of the strike passing or along with the treatment for the diarrhea. Of course, if she isn't settling, then we'd need to contact a vet further afield for her. Hopefully, that won't be the case, but if you did need to you can check for other vets near you (and it is worth speaking to equine vets too if your area is short on farm vets) at http://www.vetlocator.com/
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