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New sublinguiform vulvar flap of Haemonchus species in naturally infected domestic ruminants in Béja Abattoir, North Tunisia

This paper is available in a repository.
This paper is available in a repository.

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Abstract

The present study was conducted to determine the type of vulvar morphology in female Haemonchus worms collected from the abomasa of sheep, goats and cattle slaughtered for human consumption in Beja Abattoir in Tunisia with a Mediterranean type of climate. For the purpose, a total of 2450 female Haemonchus worms from abomasa of 363 sheep, 258 goats and 152 cattle were thoroughly examined for the types of their vulvar flap. Of the total 143 female Haemonchus worms from cattle 21.5% linguiform, 41.8% knobbed and 3.4% smooth vulvar flap types were recorded. Out of the total 645 female Haemonchus worms from abomasa of sheep, 42.5% linguiform, 36.3% knobbed and 21.2% smooth vulvar morph types were identified. In goats a total of 1662 female worms were differentiated into 27.7% linguiform 65.8% knobbed and 6.4% smooth vulvar morph types. Further subclassification of 43 linguiform vulvar flap female Haemonchus worms from cattle revealed an overall proportion of 11.5% LA type, 26.3% LB type, 17.1% LC type, 0.8% LD type and 11.0% LI linguiform subtypes. Likewise, from sheep, of the total of 327 linguiform vulvar flap female worms, 31.6% LA type, 18% LB type, 26.3% LC type, 3.9% LD type and 3.5% LI linguiform subtypes were differentiated. From goats, of the total of 461 linguiform vulvar flap female worms, 48% LA type, 13.8% LB type, 21.6% LC type, 4.4% LD type and 12.3% LI linguiform subtypes were detected. The LB sublinguifom type had the highest overall proportion in cattle, whereas the LA sub linguiform type was the most predominant in both sheep and goats. An interesting finding of the current study is the documentation of a new type of sublinguiform vulvar flap type in female Haemonchus worms for the first time, from the Mediterranean type of climate in Tunisia.