1- Aplasia of the fallopian tube:

- It is the absence of one or both tubes due to the arrested growth of the anterior third

   of the Mullerian ducts.

- It is associated with agenesis or segmental aplasia of the uterus.

- It may be unilateral or bilateral, partial or complete.

- In unilateral aplasia, the fertility is reduced.

- In bilateral aplasia, the animal is sterile.

- The animal shows estrus as the ovaries are normally developed and active.

2- Occlusion of the fallopian tubes.

- The Mullerian duct fails to canalize.

- It may be bilateral or unilateral.

- In unilateral cases, the fertility is reduced.

- In bilateral cases, the animal is sterile.

- Cystic dilatation of the fallopian tube is the sequence of occlusion of the fallopian tubes.