Hojo Takuo, Sakatani Miki, Takenouchi Naoki
Livestock and Grassland Research Division, Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization (NARO), Kumamoto, Japan.
Anim Sci J. 2018 Aug;89(8):1067-1072. doi: 10.1111/asj.13023. Epub 2018 May 28.
The usefulness of a radiotelemetric pedometer for estrus detection in standing (ST) heat, or in silent heat without ST events, but in which ovulation is observed, in Japanese Black cattle was investigated. The duration of an increase in steps in ST heat was 11.8 ± 1.3 hr, and it was similar to that of ST events (duration: 10.1 ± 0.8 hr). Even in silent heat, the change pattern and the duration (11.6 ± 0.2 hr) of the period with an increase in steps during estrus were not different compared with ST heat. When artificial insemination (AI) was performed at 15.5 ± 0.6 hr from the onset of estrus detected by the pedometer in ST heat cases, the conception rate was 57.1% (8/14). Furthermore, fertility in cattle that underwent silent heat was evaluated. When AI was performed at 14.4 ± 2.0 hr from the onset of estrus detected by the pedometer, the conception rate was 60% (3/5) in silent heat cases. The overall results suggest that the radiotelemetric pedometer is a valid device for detecting estrus and it can even detect silent heat in Japanese Black cattle. Moreover, even silent heat cattle are fertile when AI is performed at the appropriate time.
研究了一种无线电遥测计步器在日本黑牛站立发情（ST）或无ST事件的安静发情（但观察到排卵）时用于发情检测的有效性。ST发情时步数增加的持续时间为11.8±1.3小时，与ST事件的持续时间（10.1±0.8小时）相似。即使在安静发情时，发情期间步数增加阶段的变化模式和持续时间（11.6±0.2小时）与ST发情相比也没有差异。在ST发情病例中，从计步器检测到发情开始起15.5±0.6小时进行人工授精（AI）时，受胎率为57.1%（8/14）。此外，还评估了经历安静发情的母牛的繁殖力。在安静发情病例中，从计步器检测到发情开始起14.4±2.0小时进行AI时，受胎率为60%（3/5）。总体结果表明，无线电遥测计步器是一种检测发情的有效设备，甚至可以检测日本黑牛的安静发情。此外，即使是安静发情的母牛，在适当时间进行AI时也具有繁殖力。
