Embryo and foetal loss in beef heifers between day 14 of gestation and full term
Embryo and foetal loss in beef heifers between day 14 of gestation and full term
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DOI：
10.1016/s0378-4320(99)00088-3
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发表时间：
2000-02-28
影响因子：
2.2
通讯作者：
Sreenan, JM
中科院分区：
文献类型：
--
作者：
Dunne, LD;Diskin, MG;Sreenan, JM
在人工受精后，牛的繁殖失败主要表现为胚胎死亡，是畜牧业生产者经济损失的主要来源。该实验室正在对影响胚胎死亡率的因素进行研究，这有助于收集有关牛胚胎和胎儿死亡率的范围和时间的新数据。对158头肉用杂交小母牛进行同期发情，并在人工授精后第14、30天测定胚胎和胚胎存活率，随后测定产犊时胚胎存活率。第14天、第30天和足月胚胎存活率分别为68%、76%和71.8%，差异有统计学意义(P>；0.05)。根据形态检查，回收的14日龄胚胎全部被评定为1级。这些结果提供了新的信息，表明小母牛的胚胎丢失大多发生在授精后第14天之前。(C)2000 Elsevier Science B.V.保留所有权利。
Following insemination, reproductive failure in cattle is largely manifested as embryo mortality and is a major source of financial loss to livestock producers. Ongoing studies at this laboratory into factors affecting embryo mortality have facilitated the collection of new data on the extent and timing of embryo and foetal mortality in cattle. Oestrus was synchronised in 158 beef cross heifers and following artificial insemination, embryo and foetal survival rates were determined on days 14 and 30 after insemination and subsequently at calving. Embryo survival rates measured on days 14, 30 and at full term were similar at 68%, 76% and 71.8%, respectively (P > 0.05). Based on morphological examination, all the 14-day-old embryos recovered were assessed as grade 1. These results provide new information indicating that most embryo losses in heifers have occurred before day 14 after insemination. (C) 2000 Elsevier Science B.V. All rights reserved.