Evaluation of vaginal electrical resistance as an indicator of follicular maturity and suitability for timed artificial insemination in beef cows subjected to a synchronization of ovulation protocol

Zuluaga, J.F.; Saldarriaga, J. P.; Cooper, D. A.; Cartmill, J. A.; Williams, Gary L.

doi:10.1016/j.anireprosci.2007.10.002

Cited by 10 publications

(13 citation statements)

References 26 publications

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“…The overall VER values observed in the present study were relatively greater than the VER values reported previously by Wehner et al (1997), Bartlewski et al (1999), Scipioni and Foote (1999), and similar to the VER values reported by Gupta and Purohit (2001), Zuluaga et al (2008), Hockey et al (2009). These differences during the different oestrous phases may be the result of changes in intravaginal probe designs.…”

Section: Discussioncontrasting

confidence: 54%

“…The decline degree of VER was in a negative correlation to conception rate (Rorie et al, 2002;Saldarriaga et al, 2007). VER was associated with the size of the ovulatory follicle and chance of pregnancy in a group of oestrus-synchronized Bos indicus cross cattle (Zuluaga et al, 2008). The obvious relationships between VER fluctuations and changes in plasma concentrations of circulating hormones are found in sows (Dusza et al, 1996).…”

mentioning

confidence: 80%

“…Vaginal electrical resistance (VER) fluctuates with the stage of the oestrous cycle, it is the highest during the luteal phase, and declines during the follicular phase (Zuluaga et al, 2008). Measuring VER is one means for detecting oestrus in animals.…”

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confidence: 99%

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Effects of GnRH agonist immunization on vaginal electrical resistance, FSH, LH, and ovaries in prepubertal female sheep

Wei¹,

Zou²,

Zhang³

et al. 2013

CZECH J ANIM SCI

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ABSTRACT:The study is aimed at the investigation of the effects of GnRH agonist (alarelin) immunization on the vaginal electrical resistance (VER) and secretion of FSH and LH in sheep. Forty-two prepubertal female sheep were assigned to six groups (n = 7). Animals in experimental groups I (EG-I), II (EG-II), and III (EG-III) were twice subcutaneously injected with 200, 300, and 400 µg of alarelin antigens, respectively. Animals in experimental groups IV (EG-IV) and V (EG-V) were four times subcutaneously injected with 200 and 300 µg of alarelin antigens, respectively. Animals in the control group (CG) were subcutaneously injected with 2.0 ml of control liquid. Serum concentrations of FSH and LH were detected using ELISA. VER was measured by the electrical resistance detector. The follicle vertical diameter, follicle transverse diameter, theca folliculi externa thickness (FET), theca folliculi interna thickness (FIT), and follicle wall thickness (FWT) were calculated through microscope images using ImagePlus software. The results showed that the serum FSH concentration in EGs started to increase on day 14 and reached peak levels on day 35, with a maximum in EG-V. Serum LH concentration in EGs decreased from day 7 and reached the minimum levels (P < 0.05) on day 21 or 28. Serum FSH in EG-III-EG-V was higher than that in EG-I (P < 0.05) and CG (P < 0.01) in days 28-60. VER decreased after injection of alarelin antigen, the values reached the minimum levels on day 28 in EG-I and EG-II, on day 35 in EG-III-EG-V (P < 0.05), respectively. In days 45-60, VER values in EG-III-EG-V were lower than those in CG (P < 0.01). Ovarian weights in EGs were higher than those in CG; the values of FET, FIT, FWT, follicle vertical diameter (FVD), and follicle transverse diameter (FTD) in EG-III and EG-V were greater than those in CG, EG-I, EG-II, and EG-IV. In conclusion, alarelin active immunization can decrease VER, induce the synthesis and secretion of FSH, and promote follicle development in prepubertal female sheep. VER had a positive correlation with serum LH, and a negative correlation with FSH.

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Section: Discussioncontrasting

confidence: 54%

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confidence: 80%

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Effects of GnRH agonist immunization on vaginal electrical resistance, FSH, LH, and ovaries in prepubertal female sheep

Wei¹,

Zou²,

Zhang³

et al. 2013

CZECH J ANIM SCI

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“…In the current study, VER did not correlate with follicle size during the follicular wave. Other studies, however, (Markandeya et al, 1993;Gupta and Purohit, 2001;Zuluaga et al, 2008) have linked the VER with the size of the dominant follicle. The unmarked hydration changes in the vaginas of oestrous female camels (Joshi et al, 1978) may be the reason for the undifferentiated VER in dromedary camels.…”

Section: Discussionmentioning

confidence: 93%

Relationship between the size of the dominant follicle, vaginal electrical resistance, serum concentrations of oestradiol and progesterone and sexual receptivity during the follicular phase of the dromedary camel (Camelus dromedarius)

Ghoneim

Waheed

Adam

et al. 2015

Animal Reproduction Science

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“…Contrasting to the earlier findings, Foote et al (1985) described determination of ERVM as insufficiently reliable in large farms conditions to predict time for AI. Additionally, Zuluaga et al (2007) reported that determination of ERVM is not reliable in detecting the optimum time for insemination after induction and synchronization of ovulation in cows. Elving et al (1983) also reported that the method of measuring ERVM is not effective for oestrus detection in cows.…”

Section: Resultsmentioning

confidence: 99%

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

Ahmed¹,

Chowdhury²,

Rahman³

et al. 2018

Bangl. J. Vet. Med.

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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.

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Evaluation of vaginal electrical resistance as an indicator of follicular maturity and suitability for timed artificial insemination in beef cows subjected to a synchronization of ovulation protocol

Cited by 10 publications

References 26 publications

Effects of GnRH agonist immunization on vaginal electrical resistance, FSH, LH, and ovaries in prepubertal female sheep

Effects of GnRH agonist immunization on vaginal electrical resistance, FSH, LH, and ovaries in prepubertal female sheep

Relationship between the size of the dominant follicle, vaginal electrical resistance, serum concentrations of oestradiol and progesterone and sexual receptivity during the follicular phase of the dromedary camel (Camelus dromedarius)

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

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