کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8405400 1544776 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultrasonographic and endocrine aspects of follicle deviation, and acquisition of ovulatory capacity in buffalo (Bubalus bubalis) heifers
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
Ultrasonographic and endocrine aspects of follicle deviation, and acquisition of ovulatory capacity in buffalo (Bubalus bubalis) heifers
چکیده انگلیسی
The objectives of this study were to determine the interval from ovulation to deviation and the diameter of the dominant (DF) and largest subordinate (SF) follicles at deviation in buffalo (Bubalus bubalis) heifers. Two methods of evaluation (observed vs. calculated) were used. FSH and LH profiles encompassing follicle deviation (Experiment 1), and the follicular diameter when the DF acquired ovulatory capacity (Experiment 2) were also determined. The time of deviation and the diameter of the DF and the largest SF at deviation did not differ between observed and calculated methods. Overall, follicle deviation occurred 2.6 ± 0.2 d (mean ± SEM) after ovulation, and the diameters of the DF and SF at deviation were 7.2 ± 0.2 and 6.4 ± 0.2 mm, respectively. No changes in plasma levels of FSH or LH were observed (P = 0.32 and P = 0.96, respectively). Experiment 2 was conducted in two phases according to the diameter of the DF during the first wave of follicular development at the time of LH challenge (25 mg of pLH). In the first phase, follicles ranging from 5.0 to 6.0 mm (n = 7), 6.1 to 7.0 mm (n = 11), or 7.1 to 8.0 mm (n = 9) were used, and in the second phase, follicles ranging from 7.0 to 8.4 mm (n = 10), 8.5 to 10.0 mm (n = 10), or 10.1 to 12.0 mm (n = 9) of diameter were used. After the pLH treatment, the DF was monitored by ultrasonography every 12 h for 48 h. No ovulations occurred in heifers in the first phase. However, in the second phase, an effect of follicular diameter was observed on ovulation rate [7.0-8.4 mm (0.0%, 0/10), 8.5-10.0 mm (50.0%, 5/10), and 10.0-12.0 mm (55.6%, 5/9)]. In summary, follicle deviation occurred 2.6 d after ovulation in buffalo (B. bubalis) heifers, when the diameters of the DF and SF were 7.2 and 6.4 mm, respectively. No significant changes in plasma concentrations of FSH or LH were detected. Finally, the acquisition of ovulatory capacity occurred when the DF reached 8.5 mm in diameter.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Reproduction Science - Volume 123, Issues 3–4, February 2011, Pages 175-179
نویسندگان
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