In this study, infection with only single species of parasite was observed, which was caused by O.
columbianum (16%) and S. indicum (2.66%). But this result cannot be compared and contrast due to the lack of
relevant literature. Exact mechanism of single infection is not known. However, Black Bengal goats may be
more susceptible to the infection with these parasites than other parasites recovered. Besides, the fecundity of
these parasites may also be higher and developmental stages of them probably can withstand the environmental
stresses. Available literature suggests that their larvae develops at temperature from 15-37
0
C but the optimum
temperature is 30°C. In room temperature infective larvae can survive for 103 days (Agrawal, 1966).