Predicting time of parturition from changing vaginal temperature measured by data-logging apparatus in beef cows with twin fetuses
Predicting time of parturition from changing vaginal temperature measured by data-logging apparatus in beef cows with twin fetuses
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DOI：
10.1016/j.anireprosci.2004.04.046
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发表时间：
2005-03-01
影响因子：
2.2
通讯作者：
Suzuki, O
中科院分区：
文献类型：
--
作者：
Aoki, M;Kimura, K;Suzuki, O
采用数据记录仪对31头日本黑白花杂交肉牛的阴道温度（VT）进行了测定，获得了分娩前0 ~ 6 d的连续数据。对于单胎和双胎妊娠，在分娩前3-6天内观察到VT无显著差异。母体VT不受分娩后母体体重、产次、胎儿性别或胎仔总窝重的影响。双胎平均体重与母体VT呈显著正相关（r = 0.84; P < 0.05），而双胎平均体重与母体VT无相关性（r = -0.26; P = 0.61）。FM双胎母胎体重越重，母体体温越低（r = -0.82; P < 0.05）。相反，FF和MM双胞胎的母亲VT随着双胞胎体重的增加而增加。我们用两种不同的方法确定了产前VT开始下降的时间。一种是“相同小时法”，当VT持续≥ 0.3或≥ 0.5摄氏度超过3小时时，比较一天中特定时间与前一天相应时间之间的VT差异。第二种方法是“最大-最小值法”，其中将超过>= 0.3和>= 0.5 ℃的一天的最大值或最小值的降低与前一天的值进行比较。在单胎和双胎之间，在排出前VT降低的发生没有差异。为了确定预测分娩的临界条件，我们用31头收集VT的奶牛估计了可预测的预测概率。在“等时法”中，在60 It内分娩，在VT ≥ 0.3 ℃后72 h内分娩，在“最大-最小法”中，分娩概率为100%。在这些条件下的验证实验中，“相同小时法”比“最大-最小值法”具有更高的预测分娩时间的概率，并且可以通过分钟在正确的时间检测VT降低的开始。因此，“同时法”可用于预测单胎和双胎妊娠牛的分娩时间。(c)2004 Elsevier B. V.保留所有权利。
Vaginal temperatures (VT) of crossbred (Japanese Black crossed Holstein-Friesian) beef cows (n = 31) were measured by a data-logging apparatus to obtain serial data from days 0 to 6 before parturition. For both single and twin pregnancies, no significant differences were observed in VT during days 3-6 before parturition. Maternal VT was not affected by maternal weight just after parturition, parity, fetal sex, or total fetal litter weight. Average of twin litter weights for two males (MM) and two females (FF) had the strong positive correlations (r = 0.84; P < 0.05) with maternal VT, whereas twin weights of mixed-gender twins (FM) did not correlate with maternal VT (r = -0.26; P = 0.61). Maternal temperature decreased as weights of the female fetus of FM twins became heavier (r = -0.82; P < 0.05). In contrast, maternal VT of FF and MM twins increased as twin weights increased. We defined when the VT began to decrease before parturition by two different methods. One was the "same hours method" where differences in VT between a particular time of day and the corresponding time of the preceding day were compared when the VT was consistently >= 0.3 or >= 0.5 degrees C for more than 3 h. The second method was the "maximum-minimum method" where decreased in the maximum or the minimum values of the day over >= 0.3 and >= 0.5 degrees C were compared to values of preceding day. Onset of decreased VT before expulsion was not different between singletons and twins. In an attempt to define the critical condition in predicting parturition, we estimated assumable predicting probability using the 31 cows that were collected VT. When the parturition occurred within 60 It in the "same hours method" and 72 h since VT was >= 0.3 degrees C and in the "maximum-minimum method", the assumable probability was 100%. In verification experiment under these condition, the "same hours method" had a higher probability of predicting the time of parturition than the "maximum-minimum method", and it was possible to detect the onset of decreased VT at the correct time by the minutes. We concluded that "same hours method" was useful for predicting parturition time in cattle with single and twin pregnancies by the serial measurement of vaginal temperature. (c) 2004 Elsevier B.V. All rights reserved.