A survey of infestation with Hypoderma and affection to hypodermosis of cattle and goats slaughtered in Isfahan abattoir

Hypodermosis is myiasis of Hypoderma fly. Cattle and goats are specific hosts of this fly. The survey carried out in Isfahan abattoir for determining the rate of infestation and affection with consideration of age and sex in cattle and goats. For this purpose، in Cattle، the outer surface of skin، the inner surface of skin، esophageal submucosa and spinal canal and in goat، the outer surface of carcass and the inner surface of skin were examined for larvae of hypoderma. In this survey، 294 of cattle were examined and only one animal showed infestation with Hypoderma bovis L1، which observed in the spinal canal، in February and it was from Fereydonshahr area. Another one affected with Hypoderma lineatum L3 observed in June، which was from Zarrinshahr area. The time of the fly activity in Fereydonshahr and Zarrinshahr was determined early and late in summer respectively. In this survey، no Hypderma larvae observed in esophagus of examined animals. In cattle، with respect to the time of the fly activity، in two mentioned areas، the best time for using systemic larvicides to control of infestation is estimated in early and middle of autumn for Fereydonshahr and Zarrinshahr areas respectively. From 294 examined goats، 151 (51. 3%) cases were affected. In three seasons، summer، autumn and winter، 39 39. 7%)، 106 (63. 8%) and 6 (60%) affected goats were observed respectively. In goats، the minimum of affection (35. 4%) was observed in September and the maximum of affection (71. 1%) was observed in December. Statistically، there was a significant relationship (p<0. 05) between the increase of age and affection rate in goats. In terms of observing the larvae under skin of goats in Shahreza and Fereydonshahr areas، the best time for using of systemic larvicides at these areas is determined in late summer and early of spring respectively.