Identifier

etd-03242004-175322

Degree

Master of Science (MS)

Department

Animal Science (Animal, Dairy, and Poultry Sciences)

Document Type

Thesis

Abstract

The objective of Experiment 1 was to determine the effect of bovine follicular fluid (bFF) on nuclear maturation. Treatment A (Control) oocytes were stained with Hoechst-33342 immediately after aspiration from follicles, whereas, oocytes in Treatment B were held in bFF for 12 hours at 38¢ªC and then stained to determine nuclear status. No significant difference was detected between treatment groups. Results indicate that bFF inhibits resumption of meiosis. The objective of Experiment 2 was to determine the effect of bFF on embryonic development. Oocytes in Treatment A (Control) were placed into in vitro maturation (IVM) for 22 hours followed by in vitro fertilization (IVF). Oocytes in Treatment B were held in bFF for 12 hours at 22¢ªC, followed by IVM and then subjected to IVF. Significantly more (P<0.0001) oocytes cleaved, developed into blastocysts and hatched in Treatment A compared with Treatment B. Results indicate that a 12-hour holding period in bFF does not promote normal embryonic development. The objective of Experiment 3 was to determine the effect of decreased time and concentration of bFF on embryonic development. Treatment A (Control) oocytes were placed into IVM followed by IVF. Oocytes in Treatment B were held in bFF, oocytes in Treatment C were held in Lactated Ringer¡¯s Solution (LRS) and oocytes in Treatment D were held in a combination of bFF and LRS for 6 hours at 22¢ªC, followed by IVM then by IVF. No significant difference was detected between Treatments A and B when analyzing cleavage, blastocyst formation and hatching rates. However, significantly fewer (P<0.0001) embryos reached these stages of development in Treatments C and D. Nevertheless, there were significantly more embryos that developed to the blastocyst stage in Treatment D compared with Treatment C. Decreasing the amount of time that oocytes were held in bFF proved to be beneficial in supporting in vitro embryo production (IVP). These findings could be advantageous when attempting to rescue valuable gametes from deceased females.

Date

2004

Document Availability at the Time of Submission

Release the entire work immediately for access worldwide.

Committee Chair

Robert Godke

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