کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10891573 | 1082050 | 2016 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Extending the duration of treatment with progesterone and equine chorionic gonadotropin improves fertility in suckled beef cows with low body condition score subjected to timed artificial insemination
ترجمه فارسی عنوان
طول مدت درمان با پروژسترون و گونادوتروپین کوریون اسب را بهبود می بخشد. باروری در گاوهای گوشت گاو مجهول با نمره بدنی کم بدن تحت تلقیح مصنوعی به موقع
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
The objective of this study was to evaluate the effect of an extended progesterone treatment on follicular development and fertility in postpartum, suckled beef cows subjected to timed artificial insemination (TAI). In experiment 1, cows (n = 24) with body condition score (BCS) â¥4.5 received either a 2-g progesterone intravaginal device on Day â23 or a 0.558-g progesterone intravaginal device on Day â9. Then, all cows received 2 mg of estradiol benzoate on Day â9; removal of the device, 1-mg estradiol cypionate, and PGF2α on Day â2; and TAI on Day 0. Metabolic status was assessed between Days â9 and â2. Ovarian structures and plasma progesterone were determined weekly from Day â23 to â9, daily from Day â9 to 0, and weekly until Day 28. In experiment 2, cows (n = 302) with BCS â¥4.5 received identical treatment to cows in experiment 1, but on Day â2, cows received 400 IU of two different commercial preparations of equine chorionic gonadotropin (eCG). Ovarian structures were determined on Days â23 and â9 on a subset of cows (n = 40). Pregnancy was determined 39 days after TAI. In experiment 3, multiparous cows (n = 244) with BCS <5.0 received identical treatment as cows in experiment 1 initiated on Day â18, and on Day â2, cows received 400 IU of eCG or no treatment. Ovarian structures were determined in a subset of cows (n = 31) on Days â3, â2, â1, 0, 1, and on Day 10. Pregnancy was determined 39 days after TAI. The results indicated that in experiment 1, plasma progesterone was higher in treated than nontreated (control cows) during the first 14 days (P = 0.0001). The extended progesterone treatment increased the size of the largest follicle between Days â23 and Day â5 (Group by Day, P = 0.04) and tended to increase the size of the dominant follicle from Day â5 to Day â1 (Group by Day, P = 0.06). There was no effect of metabolic status or interaction between metabolic status and day on follicular growth. In experiment 2, extended progesterone treatment tended to increase the size of the largest follicle between Day â23 and â9 (P = 0.06). There was no effect of Group, eCG, BCS, and parity on pregnancy per AI. In experiment 3, extended progesterone treatment combined with eCG increased the size of the dominant follicle (P = 0.01). Both extended progesterone treatment (P = 0.02) and eCG (P = 0.03) increased pregnancy per AI. In conclusion, an extended progesterone treatment stimulated follicular growth postpartum and improved fertility only in cows with low BCS.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Theriogenology - Volume 86, Issue 2, 15 July 2016, Pages 536-544
Journal: Theriogenology - Volume 86, Issue 2, 15 July 2016, Pages 536-544
نویسندگان
M.G. Bilbao, N. Massara, S. Ramos, L.O. Zapata, M.F. Farcey, J. Pesoa, E. Turic, M.I. Vázquez, J.A. Bartolome,