Final answer:
Howell-Jolly bodies are round, basophilic nuclear remnants in RBCs often seen in cases of regenerative anemia.
Step-by-step explanation:
Round, basophilic nuclear remnants in the red blood cells (RBCs) of animals with regenerative anemia are called Howell-Jolly bodies. These are seen in the RBCs as small, round inclusions that are remnants of the erythrocyte's nucleus which the cell ejects during its maturation process. In a healthy animal, these nuclear remnants are removed by the spleen, but might persist in cases where the spleen is not functioning properly or has been removed. They can also be present in increased numbers when there is a marked increase in RBC production, usually in response to anemia.
Other options like rouleaux refers to RBCs that stack together like a roll of coins, Heinz bodies are aggregations of denatured hemoglobin in the RBCs often associated with hemolytic anemia, and agglutination is the clumping of cells and is often a result of an immune response. A complete blood count and reticulocyte count are blood tests used to assess the health and function of erythrocytes.