West Central Research and Outreach Center, University of Minnesota, 46352 State Hwy 329, Morris, MN 56267, United States; Department of Animal Science, University of Minnesota, 1364 Eckles Avenue, St. Paul, MN 55108, United States.
West Central Research and Outreach Center, University of Minnesota, 46352 State Hwy 329, Morris, MN 56267, United States; Department of Animal Science, University of Minnesota, 1364 Eckles Avenue, St. Paul, MN 55108, United States.
Anim Reprod Sci. 2020 Oct;221:106553. doi: 10.1016/j.anireprosci.2020.106553. Epub 2020 Jul 25.
The objective of this study was to evaluate estrous detection using a physical activity and rumination monitoring system in a seasonal calving organic grazing (GRAZ) and a low-input conventional (ZEROGRAZ) dairy herd. The study was conducted from June 2014 to August 2017. During each breeding season, physical activity and rumination were monitored electronically using an activity and rumination monitoring system (HR-LD tags; SCR Engineers Ltd., Netanya, Israel). Signals resulting from the activity and rumination monitoring system for individual cows were used to determine consistency of the values using this system with the breeding date of cows. Breeding dates were determined using Estrotect patches. The study included 1,463 breeding dates from 531 cows. Within the GRAZ herd, during the summer breeding season the monitoring system was less sensitive for estrous detection (33.8 %) than during the winter breeding season (79.8 %).The activity and rumination monitoring system had a sensitivity of 56.7 %, specificity of 99.3 % and positive predictive value of 59.8 % for the GRAZ herd, and sensitivity of 70.1 %, specificity of 99.2 % and positive predictive value of 66.3 % for the ZEROGRAZ herd. For cows that were determined to be pregnant and subsequently calved as a result of the mating, the sensitivity for estrous detection was slightly greater for the GRAZ (60.7 %) and ZEROGRAZ (72.5 %) herds. The activity and rumination monitoring system evaluated in this study has potential for estrous detection in grazing herds during the winter breeding season and in small-input dairy herds during both, winter and summer breeding seasons.
本研究的目的是评估在季节性放牧（GRAZ）和低投入常规（ZEROGRAZ）奶牛群中使用身体活动和反刍监测系统进行发情检测。该研究于 2014 年 6 月至 2017 年 8 月进行。在每个繁殖季节，使用活动和反刍监测系统（HR-LD 标签；SCR 工程师有限公司，以色列内坦亚）通过电子方式监测身体活动和反刍。使用来自个体奶牛的活动和反刍监测系统的信号，来确定该系统与奶牛的配种日期的一致性。配种日期使用 Estrotect 补丁确定。该研究包括 531 头奶牛的 1463 个配种日期。在 GRAZ 牛群中，夏季繁殖季节监测系统对发情检测的敏感性（33.8％）低于冬季繁殖季节（79.8％）。该活动和反刍监测系统对 GRAZ 牛群的敏感性为 56.7％，特异性为 99.3％，阳性预测值为 59.8％，对 ZEROGRAZ 牛群的敏感性为 70.1％，特异性为 99.2％，阳性预测值为 66.3％。对于那些由于交配而被确定怀孕并随后分娩的奶牛，发情检测的敏感性对于 GRAZ（60.7％）和 ZEROGRAZ（72.5％）牛群来说略高。本研究中评估的活动和反刍监测系统在冬季繁殖季节的放牧牛群和冬季和夏季繁殖季节的小投入奶牛群中具有发情检测的潜力。
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