Timing of the attraction towards the placenta and amniotic fluid by the parturient cow
Timing of the attraction towards the placenta and amniotic fluid by the parturient cow
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DOI：
10.1016/s0168-1591(96)01158-6
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发表时间：
1997-06-01
影响因子：
2.3
通讯作者：
King, GJ
中科院分区：
文献类型：
--
作者：
Machado, LCP;Hurnik, JF;King, GJ
使用 13 头围产期荷斯坦奶牛研究了对供体胎盘和供体羊水的吸引力的时间变化。九项偏好测试被录像：怀孕六个月时；预产期前 48、24、12 和 6 小时；以及产后 1、4、12 和 24 小时。偏好测试为：6 分钟选择含有青贮饲料或供体胎盘材料与青贮饲料混合的槽，4 分钟选择单独青贮饲料或与供体羊水混合。供体胎盘和羊水是在母牛分娩时收集的，并储存在零下 18 摄氏度下，直到需要进行偏好测试。每头实验牛被用作焦点动物，记录以下事件：检查青贮饲料槽；检查混合槽；在青贮饲料槽中进食或舔食；在混合槽中进食或舔食；不在低谷；照顾小牛。使用一般线性模型程序对每次测试中每种行为的时间百分比进行统计分析。在整个胎盘偏好测试中，检查青贮槽和在青贮槽中进食的时间线性减少（P < 0.003），但在与胎盘混合的青贮饲料中进食则线性增加（P < 0.002）。对比显示，产后从青贮饲料槽进食的时间明显低于从混合饲料槽进食的时间（P < 0.001）。在羊水偏好测试中，测试中唯一显着的变化是时间的线性减少（P < 0.006），而不是在波谷。然而，产前 48 小时和 24 小时的羊水偏好测试与随后的测试之间的对比显示，在后来的测试中，奶牛从混合食槽进食的时间更长（P < 0.05）。结果表明，产牛可以被供体胎盘和羊水吸引。就羊水而言，吸引力甚至可以在分娩前发生。 (C) 1997 Elsevier Science B.V.
The temporal change in the attractiveness towards donor placenta and donor amniotic fluid was studied using 13 periparturient Holstein cows. Nine preference tests were video-recorded: at six months of pregnancy; at 48, 24, 12, and 6 h before expected parturition; and at 1, 4, 12, and 24 h after parturition. The preference tests were: 6 min choice between a trough containing silage or donor placental material mixed with silage, and a 4 min choice of silage alone or mixed with donor amniotic fluid. Donor placentas and amniotic fluid were collected previously from cows at parturition and stored at - 18 degrees C until needed for preference test. Each experimental cow was used as a focal animal with the following events recorded: inspecting silage trough; inspecting mixed trough; eating or licking in silage trough; eating or licking in mixed trough; not at the troughs; care giving to calf. The percentage of time of each behaviour in each test was statistically analysed using the general linear models procedure. Throughout the placenta preference test, the time inspecting the silage trough and eating in the silage trough decreased linearly (P < 0.003), but eating in silage mixed with placenta increased linearly (P < 0.002). A contrast comparison showed a significantly (P < 0.001) lower time eating from the silage trough than from the mixed trough after parturition. In the preference test with amniotic fluid, the only significant change across tests was a linear decrease (P < 0.006) in time not at the troughs. However, a contrast comparison between the preference test with amniotic fluid at 48 and 24 h before parturition versus the subsequent tests showed the cows spending more time (P < 0.05) eating from the mixed troughs in the later tests. The results revealed that parturient cows can be attracted to donor placenta and amniotic fluid. In the case of amniotic fluid, attraction can occur even before parturition. (C) 1997 Elsevier Science B.V.