http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Endocrine profiles and ovarian responses in Bos indicus embryo donors after ovarian stimulation with two different superovulatory treatments
xiii, 129 leaves : illustrations ; 28 cm.
Endocrine and ovarian responses in Brahman cows stimulated with two different superovulatory treatments were examined. In Experiment 1, plasma progesterone (P4) concentrations were not affected (P>.40) by breed (Brahman: B, Angus:A), superovulatory treatment (FSH-P, SuperOv) or their interaction. After prostaglandin F2,,, B donors reached P4 concentrations <1 ng/ml earlier (P<.02) than A donors. Plasma estrogen (E) concentrations, the E response and plasma E:P4 ratio were significantly influenced by breed (P<.Ol) and superovulatory treatment (P<.Ol). Plasma cortisol concentrations were greater in A than in B donors (P<.05). Total number of follicles and medium sized (MF) follicles were affected by a breed x treatment interaction (P<.Ol). Breed and superovulatory treatment influenced (P<.Ol) the number of large follicles (LF). Follicular growth was greater in B (P<.Ol) than in A donors and was similar with either superovulatory treatment (P>.20). Estrus and the LH surge were suppressed in A as compared to B donors (P<.Ol). In Experiment 11, plasma P4 concentrations did not differ between high and low responders (P>.10); however, plasma E concentrations, the E response and plasma E:P4 ratio were significantly affected by the type of superovulatory response (P<.05). FSH-P increased intrafollicular E concentrations and the E:P4 ratio in LF and MF (P<.Ol) as compared to controls. Progesterone concentrations were lower in FSH-P- stimulated MF than in controls (P<.Ol). Testosterone (T) concentrations were affected by a treatment x follicle size interaction (P<.Ol); there was a tendency (P<.06) for greater insulin-like growth factor-1 (IGF-1) concentrations in LF after FSH-P stimulation. Across FSH-P-stimulated follicles, superovulatory response type did not influence concentrations of E, P4 or the E:P, ratio (P>.30) but follicle size category significantly affected P4 concentrations and the E:P4 ratio (P<.Ol). Both, superovulatory response type and follicle size category affected T concentrations (P<.Ol). Also, concentrations of IGF-1 were greater in follicles from high responders (P<.Ol) as compared to those from low responders. In summary, follicular growth was similar with either superovulatory treatment and administration of FSH-P altered plasma and follicular endocrine profiles in Bos indicus cows.
"Major Subject: Physiology of Reproduction".
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