دانلود مقاله انگلیسی رایگان:پروتکل های هوش مصنوعی به موقع مبتنی بر پروژسترون برای Bos indicus II: نتایج تولید مثل پروتکل نوع EB یا GnRH ، استفاده یا عدم استفاده از GnRH در هوش مصنوعی - 2020
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  • Progesterone-based timed AI protocols for Bos indicus cattle II: Reproductive outcomes of either EB or GnRH-type protocol, using or not GnRH at AI Progesterone-based timed AI protocols for Bos indicus cattle II: Reproductive outcomes of either EB or GnRH-type protocol, using or not GnRH at AI
    Progesterone-based timed AI protocols for Bos indicus cattle II: Reproductive outcomes of either EB or GnRH-type protocol, using or not GnRH at AI

    سال انتشار:

    2020


    عنوان انگلیسی مقاله:

    Progesterone-based timed AI protocols for Bos indicus cattle II: Reproductive outcomes of either EB or GnRH-type protocol, using or not GnRH at AI


    ترجمه فارسی عنوان مقاله:

    پروتکل های هوش مصنوعی به موقع مبتنی بر پروژسترون برای Bos indicus II: نتایج تولید مثل پروتکل نوع EB یا GnRH ، استفاده یا عدم استفاده از GnRH در هوش مصنوعی


    منبع:

    Sciencedirect - Elsevier - Theriogenology, 145 (2020) 86-93: doi:10:1016/j:theriogenology:2020:01:033


    نویسنده:

    Guilherme Madureira a, c, Carlos E.C. Consentini a, Jessica C.L. Motta a, c, Jessica N. Drum a, c, Alexandre B. Prata a, c, Pedro L.J. Monteiro Jr. a, c, Leonardo F. Melo a, Jose Renato S. Gonçalves b, Milo C. Wiltbank c, Roberto Sartori


    چکیده انگلیسی:

    The aim of these experiments was to study ovarian dynamics and fertility of Bos indicus beef cattle submitted to 7-d progesterone (P4)-based fixed-time AI (FTAI) protocols using different hormonal treatments. In Exp. 1, 2 yr old Nelore heifers (n ¼ 973) were randomly assigned to one of four treatments: EB-0 (estradiol benzoate, EB on D0 and no GnRH at AI), EB-G (EB on D0 and GnRH at AI), G-0 (GnRH on D0 and no GnRH at AI), or G-G (GnRH on D0 and at AI). On D0, heifers received an intravaginal P4 implant (0.5 g) for 7 d and EB (1.5 mg) or GnRH (16.8 mg). On D7, the P4 implant was withdrawn and heifers received cloprostenol (PGF; 0.5 mg) and estradiol cypionate (EC, 0.5 mg). Heifers in G groups also received PGF and eCG (200 IU) on D6, whereas EB heifers received eCG on D7. At FTAI on D9, only EB-G and G-G groups received GnRH (8.4 mg). In Exp. 2, Nelore cows (n ¼ 804) received the same treatments (EB-0, EB-G, G-0, or G-G) using a 1.0 g P4 implant, 2.0 mg EB, and 300 IU eCG. Effects were considered significant when P  0.05. After treatment on D0, G had more ovulations than EB in heifers (60.3 [287/ 476] vs. 12.7% [63/497]) and cows (73.7 [83/112] vs. 24.4% [28/113]). Luteolysis after D0 was greater in EB than G in heifers (39.2 [159/406] vs. 20.0% [77/385]) and cows (25.5 [14/55] vs. 1.6% [1/64]). Heifers in G had larger follicles (mm) than EB on D7 (10.3 ± 0.2 vs. 9.2 ± 0.2) and at AI (11.9 ± 0.2 vs. 11.3 ± 0.2). Cows had larger follicles in G than EB on D7 (11.0 ± 0.3 vs. 9.9 ± 0.3) but not at AI. More estrus was observed in G than EB for heifers (80.3 [382/476] vs. 69.6% [346/497]) and cows (67.6 [270/400] vs. 56.2% [227/404]). There was no interaction between D0 and D9 treatments on pregnancy per AI (P/AI) in heifers (EB-0: 56.7 [139/245], EB-G: 53.6 [135/252], G-0: 52.6 [127/241], and G-G: 57.5% [135/235]). However, cows from EBG had greater P/AI than EB-0 (69.5 [142/204] vs. 60.2% [120/200]), whereas P/AI for G-0 (62.7% [127/203]) was similar to G-G (60.9% [120/197]). In heifers, there was no interaction of GnRH at AI with estrus, however, cows that did not display estrus had greater P/AI if they received GnRH at AI (GnRH ¼ 59.1 [91/ 154] vs. No GnRH ¼ 48.2% [78/162]). Thus, protocols initiated with EB or GnRH for Bos indicus heifers and cows had differing ovarian dynamics but similar overall fertility, enabling their use in reproductive management programs. Treatment with GnRH at time of AI increased fertility in some instances in Bos indicus cows but not in heifers.
    Keywords: Beef cattle | Estrus | Fertility | GnRH | Ovulation


    سطح: متوسط
    تعداد صفحات فایل pdf انگلیسی: 8
    حجم فایل: 374 کیلوبایت

    قیمت: رایگان


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