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首页> 外文期刊>Tropical Animal Health and Production >Weight gain potential affects pregnancy rates in bovine embryo recipients raised under pasture conditions
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Weight gain potential affects pregnancy rates in bovine embryo recipients raised under pasture conditions

机译：体重增加的可能性影响在牧场条件下饲养的牛胚胎受体的怀孕率

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The aim of the present study was to evaluate the effect of differences in body weight gain after embryo transfer on the pregnancy rates of crossbred heifers used as recipients and raised under a grazing system. The study was performed during the dry (April to September) and the rainy (October to March) seasons. The embryos transferred were produced by in vitro fertilization. The body weight of each recipient was measured immediately before the embryo transfer and 23 to 25 days later, when the diagnosis of pregnancy was performed by ultrasonography. The associations among initial body weight (IBW), daily body weight gain (DWG), season, and pregnancy rate were evaluated using a logistic procedure that included the effect of the IBW, season, and linear and quadratic effects of the DWG. Altogether, there was no effect of season and pregnancy rates did not change between the dry and rainy seasons (42.3 vs. 45.8 %, respectively; P> 0.05). However, the pregnancy rate was greater in the recipients with daily body weight gains over 250 g/day, regardless of the season. In addition, the pregnancy rate of the recipients was better (P0.04) explained by a logistic regression model that included the linear and quadratic effects of the DWG. The probability of each heifer to become pregnant according to DWG is explained by the follow equation: P(y = 1) = (Exp((-1.06703 + 0.0108 * DWG-0.00002 * DWG^>2)))/(1 + Exp((-1.6703+ 0.0108* DWG-0.00002* DWG^>2))). In conclusion, body weight gain potential is a critical factor for the pregnancy rates of in vitro embryo recipients managed under grazing systems.
机译：本研究的目的是评估胚胎移植后体重增加的差异对用作接受者并在放牧系统中饲养的杂交小母牛的妊娠率的影响。该研究在干旱（4月至9月）和雨季（10月至3月）进行。转移的胚胎通过体外受精产生。当通过超声检查诊断怀孕时，立即在胚胎移植前和23至25天后测量每个接受者的体重。初始体重（IBW），每日体重增加（DWG），季节和妊娠率之间的相关性使用包括IBW的影响，季节以及DWG的线性和二次影响的逻辑程序进行评估。总体而言，在旱季和雨季之间没有季节的影响，怀孕率也没有变化（分别为42.3％和45.8％; P> 0.05）。然而，无论季节如何，每天体重增加超过250 g / day的接受者的怀孕率更高。此外，接受者的妊娠率更好（P <0.04），这是通过逻辑回归模型解释的，该模型包括DWG的线性和二次效应。每个小母牛根据DWG怀孕的概率由以下方程式解释：P（y = 1）=（Exp（（-1.06703 + 0.0108 * DWG-0.00002 * DWG <^> 2）））/（1 + Exp（（-1.6703+ 0.0108 * DWG-0.00002 * DWG <^> 2）））。总之，体重增加潜力是放牧系统管理的体外胚胎受者妊娠率的关键因素。

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