Simple Summary In the current study, we investigated the prevalence rate of Oestrus ovis (O.
ovis) larvae in heads of sheep and goats obtained from abattoirs in Riyadh, Saudi Arabia. It
was found that season did not have any significant effect on the characteristics of the larvae
that affect sheep, except for the length of larva, for which those collected in spring differed
from those collected in winter and autumn. In goats, the L3 instar number was significantly
higher during summer. Oestrus ovis larvae were detected in sheep and goats by molecular …

Heads of sheep (n= 600) and goats (n= 800) slaughtered at Al-Aziziah Abattoir in Riyadh,
Saudi Arabia, were inspected for the presence of O. ovis larvae (L). Heads were split along
the longitudinal axes, and larvae (L1, L2, and L3) were gathered. The infestation rate was
significantly higher in goats (44.5%; 356/800) than that in sheep (22.3%; 134/600). Out of the
151 collected larvae from sheep, 0% were L1, 1.3% were L2, and 98.7% were L3. Out of the
total of 468 larvae from goats, 0% were L1, 1.2% were L2, and 98.8% were L3. The …