Relationship of Electrical Resistance of Vaginal Mucus During Oestrus With Post-Ai Pregnancy in Cows

Abstract

Accurate detection of oestrus is a common problem for farmers to do AI timely resulting in conception failure in cows. The objective of the present study was to know the electrical resistance of vaginal mucus (ERVM) during oestrus to determine the best time of AI for improvement of conception in cattle. A total of 28 cows were inseminated with frozen thawed semen after detection of ERVM with Draminski estrus detector at Kendua Upazila Livestock Office under Netrakona district of Bangladesh. Pregnancy was diagnosed by per rectal palpation of genital tract 8-10 weeks after insemination. The mean ERVM in pregnant cows was 208.5 ± 31.2 Ω (163.3 to 263.3 Ω) and the ERVM in non-pregnant cows was 214.4 ± 36.6 Ω (153.3 to 280.0 Ω). Moreover, the pregnancy rate was higher in cows (80.0 to 83.3%) when ERVM during oestrus varied from 150 to 220 Ω than that of 221 to 280 Ω counterpart (36.4%). The difference in pregnancy rates between groups was significant (P<0.05). The present study indicates that Dramniski electrical heat detector may be used for prediction of time for AI in cows of Bangladesh. Up to 220 Ω ERVM during oestrus is better for higher conception rate than that of more than 220 Ω counterparts. Further studies with high number of inseminated cows should be conducted before wide application of this electrical heat detector under field conditions in Bangladesh.

Study differentiating fish oocyte developmental stages using bioimpedance spectroscopy

“…Published studies on the ovarian cycle of rats (Rattus norvegicus) described an increase of bioimpedance modulus during the proestrus phase at 1 kHz (Bartos, 1977;Taradach, 1982;Ramos et al, 2001;Jaramillo et al, 2012). For other species, especially cows and guinea pigs, studies have shown similar results (Ahmed et al, 2018;Bartos and Sedlacek, 1977). Our results are in line with this literature, as the bioimpedance modulus of samples from the vitellogenesis developmental stage were found higher at low frequencies.…”

“…In recent decades, bioimpedance measurements have been used to monitor the development of the estrous cycle in domesticated mammalian species, particularly rats and cows. According to the results of these studies, the increase in impedance correlates with the proestrus stage (Bartos, 1977;Bartos and Sedlacek, 1977;Taradach, 1982;Ramos et al, 2001;Ahmed et al, 2018;Jaramillo et al, 2012). It is important to note that all studies were conducted at a frequency of 1 kHz using a vaginal probe for the bioimpedance measurements.…”

“…Bioimpedance use seems to be spreading because it has many advantages. It is faster and less restrictive than smear tests, which is the conventional method for oocyte development monitoring (Bartos, 1977;Bartos and Sedlacek, 1977;Taradach, 1982;Ramos et al, 2001;Ahmed et al, 2018). Moreover, there is evidence that bioimpedance disrupts the oocyte cycle less than the conventional method (Taradach, 1982) because it is less invasive and does not require the repeated anesthesia of the female.…”

Association Among Spinnbarkeit, Electrical Conductivity, and Crystallization of Cervical Mucus and Pregnancy Rate in Egyptian Baladi Cows

“…Several studies investigated the relationship between the electrical resistance property of CM and the oestrus in cows (Hulsure et al, 1995). The electrical resistance of cervical mucus (ERCM) decreases dramatically during oestrus, and cows inseminated with low ERCM had a higher conception rate than those inseminated with high ERCM (Leidl and Stolla, 1976;Ahmed et al, 2017). Layek et al (2013) reported that SPK level and the arborization structure of cervical mucus strongly correlate with plasma progesterone (P 4 ) concentration and time of ovulation.…”

Investigation of vaginal mucus parameters: Development of models for staging the oestrous cycle of the Bunaji cow

“…In the same vein, lower concentration of these electrolytes brings about a reduction in ionization leading to increased vaginal mucus resistivity. The variation in vaginal mucus resistivity occasioned by changes in concentrations of the biochemical constituents has helped in staging oestrous cycle (Ahmed, Chowdhury, Rahman, Bhattacharjee, & Bhuiyan, 2018; Kitwood, Phillips, & Wiese, 1993).…”