Monitoring vaginal electrical impedance in crossbred cows during post-partum period

Habibur Rahman Mollah,Jayonta Bhattacharjee,Mohammad Mahmudul Hasan,Mohammad Rashedul Islam,Nasrin Sultana Juyena,Sattwikesh Paul,Subrota Malakar

doi:10.3329/ajmbr.v3i2.33573

Abstract

Efficient and accurate detection of estrus and correct time of artificial insemination are essential for sustainable dairy farms. Therefore, this study was carried out to monitor oestrus by observing vaginal electrical impedance (VEI) in post-partum cows. Eighteen cows with 19-139 post-partum days were included for this study. Daily VEI values were measured with heat detector®. Lower vaginal electrical resistance (VER) values were recorded during oestrus. VER of 210-240 ? might be indicative for oestrus in cows. The day difference between two successive lower values or higher values in VER waves ranged from 18 to 22 days in cows which might indicates the oestrous cycle length. Marked variation existed between VER values of two successive peaks in pregnant and non-pregnant cows, and increased (P < 0.05) VER values were observed in 2nd peak in pregnant cows. VER of 320-370 ? at 19-22 days after AI could be considered for early pregnancy. The study suggests that the measurement of vaginal impedance could serve as an indicator of the oestrus in cows and daily impedance measurements are necessary to confirm the stages of the estrous cycle, correct time of AI and early pregnancy.Asian J. Med. Biol. Res. June 2017, 3(2): 221-225

Highlights

The main constraint of sustainable cattle production is prolonged postpartum anestrus in Bangladesh
Individual vaginal electrical resistance (VER) values of estrus and estrous cycle of non- pregnant cows are presented in Figure 1a,b,c,d,e,f,g,h,i,j &k
The day difference between two successive lower peaks in VER waves ranged from 18-22 days which might indicate the estrous cycle in dairy cows

Summary

Introduction

The main constraint of sustainable cattle production is prolonged postpartum anestrus in Bangladesh. It seems that first standing oestrus in the cows usually occur 40 to 50 days after parturition. Careful examination of ovaries reveals that the first ovulation usually occur 25 to 30 days post-partum in most dairy breeds (Toribio et al, 1997). The major factor limiting reproductive performance in many dairy herds during post-partum is the failure to detect estrus in a timely and accurate manner. It is very important to monitor reproductive system when animal is in oestrus. Now-a-days, oestrus or heat detector is used to monitor estrus and oestrous cycle. Estrous detectors are evolutionary and relatively new technology designed for optimum productivity in breeding.

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Conclusion