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)