دانلود مقاله انگلیسی رایگان:پروتکل های هوش مصنوعی بهنگام پروژسترون برای Bos indicus III: مقایسه طول پروتکل - 2020
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  • Progesterone-based timed AI protocols for Bos indicus cattle III: Comparison of protocol lengths Progesterone-based timed AI protocols for Bos indicus cattle III: Comparison of protocol lengths
    Progesterone-based timed AI protocols for Bos indicus cattle III: Comparison of protocol lengths

    سال انتشار:

    2020


    عنوان انگلیسی مقاله:

    Progesterone-based timed AI protocols for Bos indicus cattle III: Comparison of protocol lengths


    ترجمه فارسی عنوان مقاله:

    پروتکل های هوش مصنوعی بهنگام پروژسترون برای Bos indicus III: مقایسه طول پروتکل


    منبع:

    Sciencedirect - Elsevier - Theriogenology, 152 (2020) 29-35: doi:10:1016/j:theriogenology:2020:04:020


    نویسنده:

    Alexandre B. Prata a, b, Guilherme Madureira a, d, Adelino J. Robl c, Heuller S. Ribeiro c, Milton Sagae c, Manoel C.V. Elias c, Cesar Pimenta c, Jhonny Barrios c, Diego Hartmman c, Althuir A. Schneider b, Gabriel A.F. Sandoval b, Milo C. Wiltbank d, Roberto Sartori a,


    چکیده انگلیسی:

    This study aimed to validate a 7 d progesterone (P4)-based fixed-time AI (FTAI) protocol for Bos indicus cattle by comparing to 8 and 9 d-type protocols. The first study compared 7 vs. 8 d protocols in Nelore heifers (Exp. 1.1; n ¼ 742) and cows (Exp. 1.2; n ¼ 2488), and the second study compared 7 vs. 9 d protocols in cows (Exp. 2; n ¼ 1343). On experimental Day 10 and Day 11 the 8 and 9 d groups received an intravaginal P4 implant, 2.0 mg estradiol benzoate (EB) and 0.5 mg cloprostenol sodium (PGF). On Day 9 the 7 d group received the same treatments (P4, EB, and PGF). Then, on Day 2 all groups had the P4 implants removed, and PGF, 0.6 mg estradiol cypionate, and 300 IU equine chorionic gonadotropin (eCG) was administered. Fixed-time AI was performed 48 h later (Day 0) and 8.4 mg buserelin acetate (GnRH) was administered to 7d-G, 8d-G and 9d-G groups, whereas 7d-0, 8d-0 and 9d- 0 groups did not receive GnRH at AI. Estrus was detected using tail-chalk between Day 2 and Day 0. Pregnancy per AI (P/AI) was evaluated by ultrasound 30 d after AI. Effects were considered significant when P  0.05, whereas a tendency was designated when P  0.10 and P > 0.05. In heifers (Exp. 1.1), incidence of estrus was similar regardless of protocol length (7 or 8 d). There was no independent treatment effect on P/AI or interaction between protocol length and GnRH at AI for P/AI (7d-0: 46.9, 7d- G: 51.4, 8d-0: 47.7, and 8d-G: 43.6%). Heifers in estrus had greater P/AI, and GnRH had no additional effect. More cows (Exp. 1.2) from the 8 d protocol were in estrus than cows submitted to the 7 d protocol. Additionally, despite no interaction between protocol length and GnRH on P/AI (7d-0: 55.9, 7d-G: 60.9, 8d-0: 56.2, and 8d-G: 60.8%), GnRH at AI increased P/AI. There was no interaction between estrus and GnRH, but cows displaying estrus had greater P/AI. Cows not expressing estrus tended (P ¼ 0.06) to have greater P/AI when receiving GnRH. In Exp. 2, more 9 d cows were in estrus than 7 d cows. Protocol length did not affect P/AI but tended (P ¼ 0.08) to interact with GnRH (7d-G had greater P/AI [57.9%] than 7d- 0 [47.6%], but 9d-0 [54.6%] and 9d-G [55.4%] were not different from other groups). Moreover, GnRH increased P/AI only for the 7 d protocol. No interaction between estrus and GnRH was detected but estrus improved P/AI, and GnRH tended (P ¼ 0.09) to improve P/AI of cows in estrus. In conclusion, despite longer protocols being more conducive to expression of estrus, there were no detectable effects of protocol length on P/AI. In addition, GnRH at FTAI may improve fertility in cows, particularly when cows are treated with shorter protocols.
    Keywords: Beef cattle | Estrus | Fertility | Nelore | Synchronization


    سطح: متوسط
    تعداد صفحات فایل pdf انگلیسی: 7
    حجم فایل: 704 کیلوبایت

    قیمت: رایگان


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