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The Interval between the Time of Ovulation and Attachment of the Bovine Embryo

Texas A. & M. College

Abstract

1. Data for this experiment were taken from 18 heifers and cows, which were killed at intervals from 676 to 927 hours after ovulation.
   
2. The first response of the caruncles in the uterus for attachment is the loss of the surface epithelium.
   
3. Attachment is not a sudden process but is gradual and continuous over a period of several weeks. The first points of attachment are immediately around the embryo and this is where the first placental plates can be seen on the chorionic membrane.
   
4. The first placental plates appeared on the surface of the chorionic membrane immediately surrounding the embryo in the 720-hour (30 days) embryo, and they first appeared on the chorionic membrane in the body of the uterus in the 850-hour (35 days and 10 hours) embryo; but none were found in the non-gravid horn in the 927-hour (38 days and 15 hours) embryo. In the early phases of attachment about two-thirds of the placental plates appeared on the ventral side of the chorionic membrane.
   

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