کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2097870 | 1082570 | 2010 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Stimulation of pulses of 13,14-dihydro-15-keto-PGF2α (PGFM) with estradiol-17β and changes in circulating progesterone concentrations within a PGFM pulse in heifers
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A single physiologic dose (0.1 mg) of estradiol-17β in sesame-oil vehicle or vehicle alone (n = 8) was given to heifers on day 14 after ovulation to study the effect on circulating 13-14-dihydro-15-keto-PGF2α (PGFM), PGFM pulses, and changes in progesterone concentrations within a PGFM pulse. Blood samples were collected hourly for 16 h after treatment. The estradiol group had a greater mean concentration of PGFM, greater number of heifers with PGFM pulses and number of pulses/heifer, and greater prominence of the PGFM pulses. Changes in progesterone concentrations were not detected during the 16 h sampling session in the vehicle group, indicating that the heifers were in preluteolysis. Progesterone decreased after 12 h in the estradiol group, indicating a luteolytic effect of the estradiol-induced PGF secretion as represented by PGFM concentrations. Intrapulse changes in progesterone were detected during a PGFM pulse in the estradiol group (P < 0.006), but not in the vehicle group. Progesterone increased (P < 0.01) between Hours â2 and â1 of an estradiol-induced PGFM pulse (Hour 0 = peak of pulse), decreased (P < 0.004) between Hours â1 and 0, and increased (P < 0.01) or rebounded between Hours 0 and 1. Results were compatible with previous reports of a role for estradiol in the induction of PGFM pulses in cattle and demonstrated intrapulse changes in progesterone concentrations during an induced PGFM pulse.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Theriogenology - Volume 74, Issue 3, August 2010, Pages 384-392
Journal: Theriogenology - Volume 74, Issue 3, August 2010, Pages 384-392
نویسندگان
O.J. Ginther, H.K. Shrestha, M.J. Fuenzalida, S. Imam, M.A. Beg,