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首页> 外文期刊>The Professional Animal Scientist >CASE STUDY: Relationships Among Live Animal Carcass Traits, the Estrous Cycle, and Synchronization of Estrus in Beef Heifers
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CASE STUDY: Relationships Among Live Animal Carcass Traits, the Estrous Cycle, and Synchronization of Estrus in Beef Heifers

机译：案例研究:活体动物之间的关系尸体特征,发情周期,同步牛肉小母牛的发情

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摘要

Studies were conducted to determine whether fluctuations in body composition quality traits occur in relation to stage of the estrous cycle and type of es-trous synchronization protocol in beef heifers. In Experiment I, measurements of live animal carcass traits by ultrasound (intramuscular fat [IMF]; rib (back) fat [BF]; rump fat [RF]; longissi-mus area [LMA] and glutens medius depth [GMD]) were initiated following synchronization of estrus (prostaglandin F_(2α); PGF_(2α)) in Angus beef heifers (n= 20) through two consecutive estrous cycles. Results indicated no direct relationship (P>0.10) among stage of the estrous cycle, hormonal status, and body composition traits. In Experiment 2, crossbred (n = 78) beef heifers were assigned to one of twoestrous synchronization groups: 1) melengestrol acetate (MGA) feeding or 2) two-injection PGF_(2α). Body composition traits were measured at weekly intervals from estrous synchrony through breeding. Body fat parameters measured were found to not be affected by synchronization protocol, and percentage IMF at breeding had no effect (P> 0.10) on conception rates. However, non-cycling heifers had less (P<0.05) IMF than heifers that expressed estrus and became pregnant Moreover, heifers that expressed estrus and did not conceive had less BF (P<0,05). Reproductive status had no relationship to LMA, RF, or GMD. These data suggest that body composition in beef heifers is not affected by stage of the estrous cycle or method of estrous synchronization. However,differences in body composition were noted between heifers that became pregnant and non-pregnant (less BF) and non-cyclic (less IMF) heifers.
机译：研究进行了确定身体成分质量的波动特征发生在发情周期的关系阶段和类型的es-trous同步协议牛肉小母牛。活体动物尸体由超声特征(肌内脂肪(IMF);臀部脂肪(RF);麸质中深度(GMD))发起的后同步发情(前列腺素f(2α);小母牛(n = 20)通过两个连续的发情周期。(P > 0.10)在发情周期阶段中,激素状态和身体成分特征。实验2,小母牛杂交(n = 78)牛肉被分配到twoestrous之一同步组:1)醋酸美仑孕酮(首先)喂养或2)两个注入PGF_(2α)。在每周组成特征测量从发情间隔同步繁殖。同步协议不受影响,和国际货币基金组织在育种百分比没有影响(P >0.10)在怀孕率。小母牛有国际货币基金组织(P < 0.05)低于小母牛此外,表示发情和怀孕小母牛发情,不表达怀孕没有男朋友(P < 0 05)。LMA地位毫无关系、射频或GMD。这些数据表明,身体成分的牛肉小母牛发情的影响阶段周期或发情同步的方法。然而,身体成分的差异指出小母牛怀孕和之间少少没有怀孕(BF)和非循环(IMF)小母牛。

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