دانلود مقاله انگلیسی رایگان:مقایسه اثرات دو پروتکل کوتاه شده با هوش مصنوعی به هنگام  روی بارداری در هوش مصنوعی در گاوهای گوشتی - 2020
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  • Comparison of the effects of two shortened timed-AI protocols on pregnancy per AI in beef cattle Comparison of the effects of two shortened timed-AI protocols on pregnancy per AI in beef cattle
    Comparison of the effects of two shortened timed-AI protocols on pregnancy per AI in beef cattle

    سال انتشار:

    2020


    عنوان انگلیسی مقاله:

    Comparison of the effects of two shortened timed-AI protocols on pregnancy per AI in beef cattle


    ترجمه فارسی عنوان مقاله:

    مقایسه اثرات دو پروتکل کوتاه شده با هوش مصنوعی به هنگام روی بارداری در هوش مصنوعی در گاوهای گوشتی


    منبع:

    Sciencedirect - Elsevier - Theriogenology, 142 (2020) 85-91. doi:10.1016/j.theriogenology.2019.09.038


    نویسنده:

    K. Macmillan a, M. Gobikrushanth b, A. Sanz c, D. Bignell a, G. Boender d, L. Macrae e, R.J. Mapletoft f, M.G. Colazo a,


    چکیده انگلیسی:

    The objective was to compare pregnancy per AI (P/AI) between two shortened timed-AI (TAI) protocols in beef cattle. This study also determined whether administration of eCG in heifers and timing of AI in cows would affect P/AI. Cattle were submitted at random to either a modified 5-d Co-synch protocol (Day 0 ¼ progesterone releasing device (CIDR); Day 5 ¼ CIDR removal and 500 mg of cloprostenol (PGF); Day 8 ¼ 100 mg GnRH concurrent with AI) or J-synch protocol (Day 0 ¼ CIDR insertion and 2mg of estradiol benzoate i.m.; Day 6 ¼ CIDR removal and 500 mg PGF; Day 9 ¼100 mg GnRH concurrent with AI). In Experiment 1, 1135 heifers (13e15 mo of age) received an estrus detection patch (Estrotect™) on Day 5 and 579 were selected at random to receive 300 IU of equine chorionic gonadotropin (eCG) at the time of CIDR removal. Patches were scored from 0 to 3 based on color change between initial application and AI; 0 ¼ unchanged, 1¼ 50% change, 2 ¼ > 50% change, 3 ¼ missing. Estrus was defined to have occurred when the patch was scored 2 or 3. In Experiment 2, 399 cyclic, non-lactating beef cows from 1 location were submitted to either the modified 5-d Co-synch or J-synch protocol and within each protocol cows were TAI at either 66 ±1 (n¼ 199) or 72 ±1 h (n ¼ 200) following CIDR removal. Transrectal ultrasonography was used in both experiments to determine presence of a corpus luteum (CL) on Day 0, and to diagnose pregnancy 35 d after TAI. In Experiment 1, eCG increased estrus rate only in heifers without a CL on day 0 that were submitted to the modified 5-d Co-synch protocol (41.9 vs. 69.6%). Heifers submitted to the J-synch protocol had greater (P ¼ 0.03) P/AI compared with those in the modified 5-d Co-synch (48.7 vs. 41.1%) and heifers that expressed estrus before AI had increased (P < 0.0001) P/AI compared to those that did not (53.6 vs. 36.5%). Administration of eCG and presence of a CL tended to affect P/AI (P ¼ 0.13). In Experiment 2, cows submitted to the J-synch protocol tended (P ¼ 0.07) to have greater P/AI compared to those in the modified 5-d Co-synch (74.1 vs. 66.5%). There was no association between P/AI and timing of AI. In summary, the J-synch protocol resulted in greater P/AI than the modified 5-day Co-synch protocol in heifers and cows. Administration of eCG increased estrus rate in heifers without a CL at the start of the protocol and tended to improve P/AI in all heifers. Timing of AI (66 vs. 72 h) had no effect on P/AI in cows subjected to either TAI protocol.
    Keywords: 5-d Co-Synch | J-synch | Pregnancy per AI | Cyclicity | Estrus detection | eCG


    سطح: متوسط
    تعداد صفحات فایل pdf انگلیسی: 7
    حجم فایل: 476 کیلوبایت

    قیمت: رایگان


    توضیحات اضافی:




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