Bioimplantable impedance and temperature monitor low power micro-system suitable for estrus detection

Miranda, N.; Morais, Raul; Dias, Isabel; Viegas, Carlos; Silva, F.; Serôdio, Carlos; Almeida, José Carlos; Azevedo, Jorge; Reis, Manuel J. C. S.

doi:10.1016/j.proche.2009.07.126

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…Hormonal variations during oestrus cycle produce variations in animal behavior and physiologic parameters. As a result, heat detection technique based on animal behavior can produce both false positives and false negatives (Miranda et al, 2009). Most detection methods are not suitable in herd practice in Bangladesh.…”

Section: Discussionmentioning

confidence: 99%

“…For this reason, the experiments were performed to study VER with heat detector probe to monitor oestrus and pregnancy in cattle during post-partum. The impedance technique is one of the tools that could be used for non-invasive monitoring of events occurring in cyclic animals (Miranda et al, 2009). There is paucity of data regarding VEI values of cows in Bangladesh.…”

Section: Discussionmentioning

confidence: 99%

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

Malakar

Juyena

Paul

et al. 2017

Asian J. Med. Biol. Res

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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 Ω 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 2 nd peak in pregnant cows. VER of 320-370 Ω 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.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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

Malakar

Juyena

Paul

et al. 2017

Asian J. Med. Biol. Res

View full text Add to dashboard Cite

show abstract

“…Heat detection technique based on animal behaviour can produce both false positives and false negatives [8]. Most detection methods are not suitable in herd practice in Bangladesh.…”

Section: Discussionmentioning

confidence: 99%

“…Estrous Detector responsive to the hormonal changes and can replace the more costly procedure of progesterone-based pregnancy detection [7]. The impedance technique is one of the tools that could be used for non-invasive monitoring of events occurring in cyclic animals [8]. Electrical impedance is measured by introducing a small alternating electrical current in the limited area of the cervix uteri, vagina, vaginal vestibule or vulva and measuring on its surface the electrical potential difference [11,16].…”

Section: Discussionmentioning

confidence: 99%

Monitoring Vaginal Electrical Impedance in Bangladeshi Water Buffaloes During Postpartum Period

et al. 2015

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The achievement of early cyclicity and pregnancy after calving are of vital importance for sustainable buffalo farms, for which proper detection of oestrus and correct time of AI are necessary. Vaginal electrical impedance (VEI) observation using heat detector was used to identify estrus in buffalo cows during post-partum period. In the first group, 12 buffalo cows with post-partum>300 days were synchronized with OVSYNCH protocol and VEI was recorded at different stages of synchronization protocol. VEI values decreased significantly (P < 0.01) during second administration of GnRH in both pregnant and non-pregnant buffalo cows and it was indicative for the presence of oestrus. Higher VEI values were obvserved at second administration of GnRH and AI in non-pregnant group than the pregnant group. In second group, 8 buffalo cows with a post-partum period 40 to 96 days were used to record VEI daily. Lower VEI values (260-350) were observed during oestrus and then started to increase at higher level after oestrus. The day difference between two successive lower/higher values of "VEI waves" ranged from 17-25 days, which might indicate the oestrous cycle in buffalo cows. Moreover, physical signs such as colour of vulva, mucus were less intensive in buffalo cows of second experiment. The study suggests that the measurement of vaginal impedance could serve as an indicator of the oestrus in buffalo cows and daily impedance measurements are necessary to confirm the stages of the estrous cycle.

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“…However, it has not yet been applied in the management of reproduction, because of lacking the supporting automated technology. Morais [ 14 ] and Miranda [ 15 ] reported the automatic detection of body temperature via implanting the temperature sensor into the cows’ vulvar muscles. Unfortunately, this approach cannot be used in dairy cows due to the vaginal damage.…”

Section: Introductionmentioning

confidence: 99%

Automated measurement of cattle surface temperature and its correlation with rectal temperature

et al. 2017

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The body temperature of cattle varies regularly with both the reproductive cycle and disease status. Establishing an automatic method for monitoring body temperature may facilitate better management of reproduction and disease control in cattle. Here, we developed an Automatic Measurement System for Cattle’s Surface Temperature (AMSCST) to measure the temperature of metatarsus by attaching a special shell designed to fit the anatomy of cattle’s hind leg. Using AMSCST, the surface temperature (ST) on the metatarsus of the hind leg was successively measured during 24 hours a day with an interval of one hour in three tested seasons. Based on ST and rectal temperature (RT) detected by AMSCST and mercury thermometer, respectively, a linear mixed model was established, regarding both the time point and seasonal factors as the fixed effects. Unary linear correlation and Bland-Altman analysis results indicated that the temperatures measured by AMSCST were closely correlated to those measured by mercury thermometer (R2 = 0.998), suggesting that the AMSCST is an accurate and reliable way to detect cattle’s body temperature. Statistical analysis showed that the differences of STs among the three seasons, or among the different time points were significant (P<0.05), and the differences of RTs among the different time points were similarly significant (P<0.05). The prediction accuracy of the mixed model was verified by 10-fold cross validation. The average difference between measured RT and predicted RT was about 0.10 ± 0.10°C with the association coefficient of 0.644, indicating the feasibility of this model in measuring cattle body temperature. Therefore, an automated technology for accurately measuring cattle body temperature was accomplished by inventing an optimal device and establishing the AMSCST system.

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Bioimplantable impedance and temperature monitor low power micro-system suitable for estrus detection

Cited by 6 publications

References 5 publications

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

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

Monitoring Vaginal Electrical Impedance in Bangladeshi Water Buffaloes During Postpartum Period

Automated measurement of cattle surface temperature and its correlation with rectal temperature

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