The eggs after fertilization stay in the uterus for some time which later rich the bile duct, then in the intestine of the host and finally pass out with the faces.

Under suitable conditions, the eggs are hatched into ciliated larvae, which swim in search of suitable host and enter in its pulmonary sac.

After 8 days miracidium forms sporocyst from which 3 to 8 rediae larvae are formed. Now these rediae enter the liver of the snail and produce more rediae parthenogenetically.

From each daughter rediae the other larval form id formed. The cercaria larva, which is provided with slender tail, sucker and intestine, burrows the snail and comes out of the snails’ body. Now it starts swimming, attaches itself with grasses, loses its tail gets encysted and forms the metacercariae which enters the alimentary canal of the sheep at the time of water drinking or grazing the grasses. In the alimentary canal of sheep cyst gets dissolved and metacercariae reach the liver by burrowing the alimentary canal of the sheep.

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First they damage the liver tissues and then enter the bile duct and get matured.

Disease:

The infection of liver fluke cause the rotting of sheep’s liver. A number of diseases viz., anemia, diarrhea, dysentery, eosinophilia and ulcers have been noticed in the liver fluke-infested sheep. The production of both the quality and quantity of leather, meat and wool from the sheep is badly affected due to infection of fasciola hepatica.