Timing of insemination for dairy cows identified in estrus by a radiotelemetric estrus detection system
Timing of insemination for dairy cows identified in estrus by a radiotelemetric estrus detection system
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DOI：
10.3168/jds.s0022-0302(98)75758-3
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发表时间：
1998-07-01
影响因子：
3.5
通讯作者：
Warnick, LD
中科院分区：
文献类型：
--
作者：
Dransfield, MBG;Nebel, RL;Warnick, LD
人工授精（AI）的最佳时间是从数据中确定的2661 AI在17个牛群利用无线电遥测系统的发情检测，有可能连续24小时监测，以监测与发情相关的行为事件。该系统由固定在奶牛骶骨区域的压敏射频发射器组成，传感器的激活通过固定天线向微计算机发送无线电遥测信号。在系统随附的软件程序中记录奶牛识别、每次站立事件的日期、时间和持续时间。每个农场选择3小时间隔，以供在前24小时内确定发情期的奶牛使用。根据Al后35至75天恢复发情和子宫触诊的数据确定妊娠状态。发情期间站立事件平均（+/-SD）为每头母牛8.5 +/-6.6起，牛群中每次发情的事件数量平均为每头母牛6.2 +/-5.1至12.8 +/-9.9起。各畜群的发情持续时间范围为5.1 +/-3.8至10.6 +/-6.8 h;平均值为7.1 +/-5.4 h。从第一次站立事件到铝的间隔影响怀孕的概率;铝的最高受孕率发生在站立活动开始后4至12小时之间。妊娠的可能性较高的奶牛> 100天的牛奶，表现出> 2站在发情期的事件，并在3月，4月或5月授精。
The optimal time of artificial insemination (AI) was determined from data for 2661 AI in 17 herds utilizing a radiotelemetric system for estrus detection that has the potential for continuous 24-h surveillance to monitor behavioral events associated with estrus. The system consisted of pressure-sensitive radio frequency transmitters affixed over the sacrum region of cows,The activation of the sensor sent a radiotelemetric signal to a microcomputer via a fixed antenna. Cow identification, date, time, and duration of each standing event were recorded in the software program provided with the system. Each farm selected a 3-h interval to Al far cows that were identified in estrus during the previous 24 h. Pregnancy status was determined from data for return to estrus and palpation of the uterus 35 to 75 d following Al. Standing events during estrus averaged (+/- SD) 8.5 +/- 6.6 per cow, and the number of events per estrus across herds averaged from 6.2 +/- 5.1 to 12.8 +/- 9.9 per cow. The duration of estrus ranged from 5.1 +/- 3.8 to 10.6 +/- 6.8 h across herds; the mean was 7.1 +/- 5.4 h. The interval from the first standing event to Al affected the probability of pregnancy; the highest conception rates for Al occurred between 4 and 12 h after the onset of standing activity. The probability of pregnancy was higher for cows >100 d in milk, exhibiting >2 standing events during estrus, and inseminated during March, April, or May.