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Biological Characterization of Ovulation-Inducing Factor (OIF) in Llama Seminal Plasma.

Author: Adams, Gregg P; Pierson, Roger; Mapletoft, Reuben; Carruthers, Terry; Singh, Baljit; Tanco, Valeria Maria
Publisher: University of Saskatchewan 2008-07-02.
Dissertation: Thesis / Dissertation ETD.
Edition/Format:   Thesis/dissertation : Thesis/dissertation : eBook : English
Summary:
The purpose of the studies reported in this thesis was to provide a better understanding of the effects of purified ovulation-inducing factor (OIF) from llama seminal plasma in reflex ovulators (lama glama) and spontaneous ovulators (Bos taurus). The objective of the first study was to determine if the dose of OIF of llama seminal plasma required to elicit ovulation is physiologically relevant, and to test the  Read more...
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Details

Genre/Form: Text
Material Type: Thesis/dissertation, Internet resource
Document Type: Internet Resource
All Authors / Contributors: Adams, Gregg P; Pierson, Roger; Mapletoft, Reuben; Carruthers, Terry; Singh, Baljit; Tanco, Valeria Maria
OCLC Number: 654967004
Language Note: English.
Notes: Application/pdf.

Abstract:

The purpose of the studies reported in this thesis was to provide a better understanding of the effects of purified ovulation-inducing factor (OIF) from llama seminal plasma in reflex ovulators (lama glama) and spontaneous ovulators (Bos taurus). The objective of the first study was to determine if the dose of OIF of llama seminal plasma required to elicit ovulation is physiologically relevant, and to test the hypothesis that CL form and function is affected by OIF in a dose-dependent manner. Llamas were treated with four different doses (500 £gg, 250 £gg, 125 £gg and 60 £gg) based on knowledge that for every ejaculate there is approximately 3 mg of OIF. Results supported the hypothesis that OIF affects ovulation and CL form and function in a dose-dependent manner. The high dose of OIF (500 Ýg) was associated with the highest incidence of ovulation, maximum CL diameter, plasma progesterone concentrations and plasma LH concentrations. The low dose of OIF (60 Ýg) was minimally effective for induction of ovulation and associated with smaller CL diameter and lower plasma concentrations of progesterone and LH. The second study was carried out to test the hypotheses that OIF will induce ovulation and affects CL form and function in cattle (Experiment 1), and that OIF given at different stages of development of the first follicular wave will induce atresia of the dominant follicle and hasten emergence of a new follicular wave (Experiment 2). Heifers were treated on Day 5 (Day 0 = wave emergence; Experiment 1) or on Days 3, 6 and 9 (Experiment 2) with a) 1ml of saline, b) 100 £gg of GnRH, or c) 1.0 mg purified OIF per 100 kg of body weight. Results of Experiment 1 demonstrated that OIF did not induce ovulation in cattle but it did induce atresia of the dominant follicle and earlier emergence of a new follicular wave. Results from the second study suggested that the effect previously demonstrated could be accomplished in sexually mature females after treatment on Day 6 corre.

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Primary Entity

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