Effects On Sheep
Blowfly strike, or flystrike is a serious welfare problem in the animal industry. This cutaneous myiasis or infestation not only causes severe discomfort or stress to the animal, but will also cause death when left untreated. Ewe lambs and female sheep are primarily affected and are struck predominately in the rear quadrant of the animal due to fecal staining. Due to the difficulty in controlling these flies, there are considerable losses in the sheep industry every year. Also, there is an increasing concern of the insecticidal use and the surgical procedures done to control L. cuprina, making this not only an animal welfare issue but also an economical one. The maggots of L. cuprina rapidly grow while eating the living flesh of the sheep while secreting ammonia, thus, poisoning the sheep. Sheep show signs of skin irritation by rubbing and biting the affected areas during the first few days after the eggs have been laid. This causes an inflammatory response in the sheep resulting in severe irritation and pyrexia. Once a flystrike has started other flies are attracted to the site. Although treatment is available, the delayed response time due to symptoms allows wool breakage in the affected area and fleece to be tender overall. There are many predispositions to the flystrike that make a host more favorable, including an infection with dermatophilosis and footrot, both of which can be treated and prevented. In some animals a weak resistance can develop, but this immune response is often associated with a decrease in productivity which is an undesirable trait.
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