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• W2132071710 abstract "Fluctuations in peripheral concentrations of total unconjugated estrogens (E) and the response of luteinizing hormone (LH), testosterone (T), and total glucocorticoids (GC) to administration of exogenous estradiol-17β (E2) were studied in the male bovine in two experiments. In Experiment 1 hourly blood samples were collected via jugular cannula from four puberal Angus bulls during 24 h preinfusion, 12 h infusion and 12 h postinfusion periods. Episodic fluctuations in peripheral concentrations of E, LH, T, and GC were observed during the 24 h preinfusion period; however, the only significant temporal relationship observed was between concentrations of LH at 1 h and concentrations of T at the subsequent hour (LAG-LH-T-CORR, r = 0.42). Infusion of E2 at the rate of 41.7 mg/h resulted in acute increases in circulating concentrations and areas beneath hormone profile curves for LH, T, and CC. During the postinfusion period, both LH and T areas were less than areas calculated for similar times during the preinfusion period. In contrast, GC areas were greater (P<0.10) during the postinfusion period than at similar times prior to infusion. Based on results of the first experiment, Experiment 2 was designed to compare the effects of E2 infusion on circulating levels of LH, T, and GC between eight control and seven E2-treated bulls. Blood samples were collected every 30 min for a 6 h preinfusion period after which E2 or propylene glycol was continuously infused for 6 h at a rate of 16.7 mg/h. Samples were also collected for a maximum of 6 h postinfusion. Significant acute increases in circulating concentrations and areas of LH and T were observed in five of seven E2-treated bulls. There were no changes in hormone levels of control bulls during infusion. Both LH and T areas were not significantly different between E2-treated and control bulls during the postinfusion period. Infusion of E2 did not influence levels of circulating GC and areas of GC. These results demonstrate that E can be included with LH, T, and GC as hormones whose peripheral concentrations fluctuate in an episodic manner. Also, administration of pharmacological levels of E2 can result in an acute increase in levels of circulating LH and T." @default.
• W2132071710 created "2016-06-24" @default.
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• W2132071710 date "1980-12-01" @default.
• W2132071710 modified "2023-09-25" @default.
• W2132071710 title "Episodic Fluctuation of Total Estrogens in Peripheral Blood of Bulls: Effects of Estradiol-17β on LH and Testosterone Secretion1" @default.
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• W2132071710 doi "https://doi.org/10.1095/biolreprod23.5.1029" @default.
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