Anterior Presentation; Closed Cervix.

Anterior Presentation; Closed Cervix.
Most calves are born in anterior, longitudinal presentation and are carried that way for the latter part of gestation. It is unlikely that the fetus is capable of changing its orientation from cranial to caudal after the fifth month of gestation when the fetus has attained the size of a large cat and when there is insufficient room for the fetus to turn around in utero.

Drost M (1974)