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首页> 外文期刊>Archivos Latinoamericanos de Produccion Animal >Factors affecting reproductive response in anestrous crossbred cows treated with intravaginal progesterone or calf removal for 120 hours
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Factors affecting reproductive response in anestrous crossbred cows treated with intravaginal progesterone or calf removal for 120 hours

机译：影响经阴道内黄体酮或去除小牛120小时的无情杂种母牛生殖反应的因素

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To study the effect of season (August-October, EP1; February-March, EP2), predominant breed ( Bos taurus , BT; Bos indicus , BI), and number of parturitions ( primiparous , PC; multiparous , MC) on reproductive response, 167 crossbred anestrous cows that were 90 to 130 d postpartum were allotted randomly to one of the following treatments: IP (n = 59), intravaginal sponge with 250 mg of medroxyprogesterone acetate (MAP) for 7 d; first day of treatment (Day 0), 50 mg MAP and 5 mg 17α-estradiol (17α-E) intramuscular (im); Day 5, 500 IU of eCG; 24 h after sponge removal (Day 8), 1.5 mg 17?-E im. CR (n = 57), temporary calf removal for 120 h. CG (n = 51), control group without treatment. Data were analyzed using Chi-square and GLM procedures. Season did not affect the reproductive response under the IP treatment; however, in EP2 cows under CR and/or CG had better reproductive response than in EP1: estrous rate (ER) was: CG: 36.8 vs 13.8%, respectively (P 60): CR: 55 vs 23.3%, respectively (P 60 than BI (62.5 vs 43.5%; P primiparous cows under CR had lower ER than multiparous (39.5% vs 68.2%; P 60 was 3.5 times lower in PC than in MC cows (7.7 vs 27.3%; P < 0.07). Also, in CG the PFS was shorter in MC than PC cows (153.8 vs 173.7 d; P < 0.05). Overall, the IP treatment followed by CR gave greater estrous rate, accumulated pregnancy at 30 and 60 d post-treatment and reestablished pregnancy in a shorter period after calving than the non-treatment control.
机译：研究季节（八月至十月，EP 1 ;二月至三月，EP2），主要品种（Bos taurus，BT; Bos indicus，BI）和分娩次数（初产，PC）的影响;对生殖反应有多产（MC），将167头产后90至130天的杂种无情母牛随机分配给以下一种治疗方法：IP（n = 59），阴道海绵内加250 mg醋酸甲羟孕酮（MAP）7 d;治疗的第一天（第0天），50 mg MAP和5 mg肌内（im）17α-雌二醇（17α-E）;第5天，eCG为500 IU;去除海绵后24小时（第8天），加入1.5 mg 17？-E im。 CR（n = 57），暂时去除小腿120小时。 CG（n = 51），对照组不予治疗。使用卡方和GLM程序分析数据。在IP处理下，季节不影响生殖反应;然而，在CR和/或CG条件下，EP2奶牛的生殖反应要比在EP 1 中更好：发情率：CG：36.8 vs 13.8％（P 60 ） ：CR：分别为55 vs 23.3％（P 60 比BI（62.5 vs 43.5％; CR下的P初产奶牛的ER低于多胎ER（39.5％vs 68.2％; P 60 是3.5倍） PC较MC奶牛低（7.7 vs 27.3％; P <0.07）;而且，CG中MC的PFS短于PC奶牛（153.8 vs 173.7 d; P <0.05）。与未治疗的对照组相比，其发情率更高，在治疗后30和60 d累积怀孕，并且在产犊后更短的时间内恢复怀孕。

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