牛发情期活动量与阴道黏液电阻值变化规律的研究

doi:10.11843/j.issn.0366-6964.2017.07.006

Abstract

Abstract:

It is important to determine the insemination time by using accurate estrous detection and ovulation prediction.In this study,10 multiparous Simmental cattle and 10 primiparous Holstein cows, which were 60 to 90 days postpartum, healthy and nonpregnant, were used as experiment animals. After estrus synchronization, the oestrus and ovulation time of cattle were detected by observation and rectal examination, and the corresponding activity and vaginal electrical resistance (VER) were measured by using pedometers in an interval of 30 min and estrus ovulation tester in an interval of 4 h, respectively. Results showed that, the VER in dioestrus ((300±12) Ω) was significantly higher than that in oestrus (P <0.05), and decreased rapidly 4 h before the onset of oestrus and dropped to the lowest ((220±27) Ω) 8-12 h after the onset of oestrus, and then gradually recovered to the dioestrus level after ovulating. The activity in dioestrus was lower than that in oestrus, and increased 10 times rapidly after the onset of oestrus, and then recovered to the dioestrus level after the end of oestrus. The oestrus duration, the time from onset of oestrus to ovulation and the time from end of oestrus to ovulation were (15.6±2.8) h, (26.8±4.2) h and (11.3±4.3) h, respectively. The ovulation occurred (15.0±1.3) h later after the lowest VER. The activity and VER variation could provide guidance to explore the techniques of accurate oestrus detection and insemination during oestrus and ovulation. The actvity combined with VER would improve oestrus detection efficiency and timing of ovulation predicted accuracy, which have significant value for developing the automatic technology of oestrus detection and ovulation prediction.

CLC Number:

S823.9

KOU Hong-xiang, LI Lan-qi, WANG Zhen-ling, REN Kang, LI Shu-jing, LU Yong-qiang, WANG Dong. Study on the Regulations of Activity and Vaginal Electrical Resistance of Cattle during the Estrous Cycle[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2017, 48(7): 1221-1228.

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Study on the Regulations of Activity and Vaginal Electrical Resistance of Cattle during the Estrous Cycle

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