A Discussion on reproductive failure in cattle

Abstract

The terminology used in this discussion will coincide with that recommended by the Committee on Bovine Nomenclature (Hubbert). Early embryonic death refers to deaths occurring from the day of conception until about 42 days of gestation, which coincides with the end of the stage of differentiation. Embryos lost during this period may be either absorbed or aborted. Fetuses discharged from day 42 until approximately 260 days are generally called abortions and from day 260 unit term, premature deliveries.