
Embedded Corpus Luteum.
The ovulation papilla of the corpus luteum of the buffalo does not always protrude very far beyond the surface of the ovary, making it difficult to identify by palpation per rectum.
Vale WG (1987)

Ovarian Cross Section.
The ovary on the left shows a pale corpus albicans on cross section. The ovary on the right shows a CL with a central cavity (lacuna), which is a normal finding. Such CL function normally and produce the same relative amount of progesterone.
Vale WG (1987)

Normal Ovaries.
Normal inactive ovaries. No evidence of follicular activity. Faint evidence of remnants of corpora albicantia.
Vale WG (1987)

Follicular Cyst.
Follicular cyst in a pluriparous buffalo. These cysts most commonly occur in the postpartum buffalo when she resumes cycling.
Vale WG (1987)

Buffalo CL vs Zebu CL.
The corpus luteum of the buffalo, shown on the left, is more deeply embedded in the stroma than the corpus luteum of Bos indicus on the right. The ovulation papilla is less prominent in the buffalo, hence more difficult to palpate per rectum. Parenthetically, the ovulation papilla of the CL of Bos indicus in turn is less prominent than that of Bos taurus.
Vale WG (1987)