Date of Award:
Doctor of Philosophy (PhD)
Animal, Dairy, and Veterinary Sciences
G. Reed Holyoak
G. Reed Holyoak
The role of ammonia in reproductive inefficiency in early lactation dairy cows was studied in a series of experiments designed to determine the concentrations of ammonia in normal bovine follicular fluid (bFF), to determine the effects of ammonia on the bovine embryo during specific stages of development, and to test the hypothesis that elevated plasma urea nitrogen concentration is associated with elevated ammonia and urea nitrogen concentrations in the reproductive fluids.
In the first study, ammonia concentration in different size follicles and the effect of ammonia during in vitro maturation on embryo development were determined. Ammonia concentration in the bFF was significantly different (P10 mm) and ammonia concentration decreased as follicle size increased. There was no difference (P>0.05) in cleavage rates, morula development, and blastocyst development when oocytes were exposed to various concentrations of ammonia during in vitro maturation.
In the second study, the effects of addition of ammonia in the media during in vitro fertilization (IVF), culture (IVC), and throughout maturation (IVM), IVF, and IVC were evaluated. Addition of moderate concentrations of ammonia to IVF media resulted in a significant (P
In the third study, plasma urea nitrogen (PUN) concentrations were related to follicular and uterine fluid ammonia and urea concentrations in early lactation dairy cows. Mean PUN concentrations were used to distribute the cows into two groups: 1) cows with PUN ≥ 20 mg/dl (HPUN), and 2) cows with PUN<20mg/dl (LPUN). Follicular fluid ammonia and follicular fluid urea were significantly (P
Hammon, Douglas Scott, "The Role of Ammonia in Reproductive Inefficiency in High-Producing Dairy Cows Fed Excess Rumen Degraded Protein" (1998). All Graduate Theses and Dissertations. 3959.
Copyright for this work is retained by the student. If you have any questions regarding the inclusion of this work in the Digital Commons, please email us at .