Predicting optimal time of insemination in cows that show visual signs of estrus by estimating onset of estrus with pedometers
Predicting optimal time of insemination in cows that show visual signs of estrus by estimating onset of estrus with pedometers
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DOI：
10.3168/jds.s0022-0302(97)76035-1
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发表时间：
1997-06-01
影响因子：
3.5
通讯作者：
Engel, B
中科院分区：
文献类型：
--
作者：
Maatje, K;Loeffler, SH;Engel, B
本试验旨在探讨从发情开始到人工授精（AI）的最佳间隔时间。通过数学模型分析数据。该分析是基于121头奶牛的171个乳房植入体在AI后42至49天的计步器读数和直肠触诊结果。在增加计步器活动后6至17小时，受孕机会最高：估计最佳时间为11.8小时。在该数据文件中，疾病、感染者、Al时间（上午或下午），bull对模型的改进没有贡献。疾病的影响并不显著，因为任何特定疾病的发病率都很低。活动测量可用作AI策略的工具，以改善已经显示发情视觉迹象的健康奶牛和小母牛的受孕。
An experiment was designed to estimate the optimal interval from the beginning of estrus to artificial insemination (AI). The data were analyzed by means of a mathematical model. The analysis was based on pedometer readings and results of rectal palpation at 42 to 49 d post-AI of 171 breedings in 121 cows. The chance of conception was highest between 6 and 17 h after increased pedometer activity: the estimated optimum was at 11.8 h. In this data file, the effects of disease, inseminator, time of Al (a.m. or p.m.), and bull did not contribute to the improvement of the model. The effects of disease were not significant because of the low incidence of any specific disease. Activity measurements can be used as a tool for Al strategy to improve conception in groups of healthy cows and heifers already showing visual signs of estrus.