کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5523067 1546071 2017 5 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Equine chorionic gonadotropin increases fertility of grazing dairy cows that receive fixed-time artificial insemination in the early but not later postpartum period
ترجمه فارسی عنوان
گنادوتروپین کوریونی اسب باعث افزایش باروری گاوهای شیری گاو می شود که دوره تلقیح مصنوعی ثابت در اوایل دوره پس از زایمان را دریافت می کنند
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
چکیده انگلیسی


- The hypothesis that 400 IU eCG in a P4/E2-based FTAI protocol would increase P/AI of crossbred grazing dairy cows was tested.
- Treatment with eCG on D7 of a FTAI protocol tended to increase fertility due to greater P/AI in cows inseminated at ≤70 DIM.
- Treatment with eCG on D7 of a FTAI protocol was not effective to improve P/AI in the late postpartum.

This study evaluated effects of equine chorionic gonadotropin (eCG) on fertility of 679 crossbred (Bos taurus x Bos indicus) lactating grazing cows synchronized for fixed-time AI (FTAI). At a random day of the estrous cycle cows received an intravaginal progesterone (P4) implant, 2 mg estradiol benzoate (EB) and 100 μg gonadorelin (D0-AM). On D7-AM, cows received 0.5 mg sodium cloprostenol and were randomly assigned into two treatments: eCG (n = 340; 400 IU eCG on D7), or Control (n = 339; no eCG). On D8-PM, P4 implants were removed and cows received 0.5 mg sodium cloprostenol and 1 mg EB. Insemination was performed on D10-AM. Pregnancy was diagnosed 30 and 60 d after AI. Treatment with eCG tended to increase pregnancy per AI (P/AI) compared to Control at 30 (37.8 vs. 30.2%; P = 0.06) and 60 (31.9 vs. 25.1%; P = 0.08) d. Pregnancy loss and twinning did not differ between groups. Treatment with eCG increased (P < 0.05) P/AI at 30 (39.0 vs. 25.2%) and 60 (32.8 vs. 21.3%) d for cows inseminated at ≤ 70 d in milk (DIM) but had no effect in cows receiving AI after 70 DIM. Thus, eCG on D7 of a FTAI protocol increased fertility of crossbred dairy cows inseminated in the early postpartum period.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Theriogenology - Volume 98, August 2017, Pages 36-40
نویسندگان
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