Comparative Studies of Estrous Synchronization, Ovulation Induction, Luteal Function and Embryo Cryopreservation in Domestic Sheep and Application to Related Nondomestic Ungulate Species
Abstract
The general hypothesis of this investigation is that domestic sheep can serve as valuable research models for developing, applying and comparatively examining conventional and new embryo biotechniques which can be integrated toward the preservation of related nondomestic species. A series of projects focused on: 1) analyzing the effects of various hormonal ovulation induction procedures on ovarian function and the production of transferable quality embryos; 2) determining whether atraumatic embryo collection/transfer procedures could be developed and efficiently applied without compromising subsequent fertility; and 3) evaluating novel cryoprotective solutions and cooling procedures for cryopreserving embryos. In Project I, it was determined that the number of corpora lutea (CL) and transferable quality embryos was greater (P<0.05) in follicle stimulating hormone (FSH-P)- and human menopausal gonadotropin (hMG)-treated sheep than in pregnant mares' serum gonadotropin (PMSG)-treated ewes. However, regardless of the type of gonadotropin treatment, a high proportion ( 40%) of ewes experienced premature luteal regression which was associated with embryo collection failure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 20, 1989
- Accession Number
- ADA634767
Entities
People
- Mitchel C. Schiewe
Organizations
- Uniformed Services University of the Health Sciences