Equine body temperature and progesterone fluctuations during estrus and near parturition

Ammons, S.F.; Threlfall, W.R.; Kline, Robert C.

doi:10.1016/0093-691x(89)90484-6

Cited by 16 publications

(4 citation statements)

References 23 publications

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“…This steroid is believed to act on the thermoregulatory centre in the hypothalamus, and a significant drop in progesterone (ie, eminent parturition) would cause the drop in body temperature. However, this may not be the case in horses, since there was no significant correlation between body temperature and peripheral progesterone concentrations in periparturient mares (Ammons and others 1989). Other authors (Ammons and others 1989, Cross and others 1992) reported that body temperature in the mare did not predict parturition, but our findings showed a reduction in the mare's body temperature on the evening of foaling (Fig 4).…”

Section: Discussionmentioning

confidence: 97%

Decreasing pH of mammary gland secretions is associated with parturition and is correlated with electrolyte concentrations in prefoaling mares

et al. 2013

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The objectives of this study were to determine pH of the mammary gland secretions and the corresponding electrolyte concentrations in prefoaling mares. Pregnant mares (seven primiparous and seven multiparous) were monitored daily from 310-320 days of gestation until parturition. Prefoaling mammary gland secretions were collected, and pH was immediately determined with a pH meter and pH strip test. An aliquot of prefoaling mammary secretions was frozen and stored until further analyses. After parturition, samples from day -4 to 0 (day of foaling) were thawed and electrolyte concentrations (ie, Ca(2)(+), Mg(2)(+), Na(+), K(+) and Cl(-)) were determined with an automated analyser. Data were analysed via a mixed model with the mare as a random effect. Correlations were determined between pH and electrolyte concentrations by the Pearson product-moment for each pair. There was significant reduction in pH of mammary secretions on the day of foaling (P<0.0001), and most mares (11/14) with a pH ≤7 foaled within 24 hours. There was high correlation between the two pH methods (r=0.93). Additionally, there were significant (P<0.05) increases in Ca(2+) and K(+) concentrations, and significant decreases in Na(+) and Cl(-) concentrations from one day before to the day of foaling. The pH of mammary secretions was highly and significantly (P<0.001) correlated with Na(+) (r=0.87), Cl(-) (r=0.85), Ca(2+) (r=-0.88); and K(+)(r=-0.80) concentrations, and moderately correlated with Mg(2+) (r=-0.58). Daily evening pH measure of the mammary gland secretions can predict foaling in most mares.

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Section: Discussionmentioning

confidence: 97%

Decreasing pH of mammary gland secretions is associated with parturition and is correlated with electrolyte concentrations in prefoaling mares

et al. 2013

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“…6,7 Several commercial aids are available for use in determining approximately when parturition will occur. The vagina and vulva relax and there is an increase in mucus.…”

mentioning

confidence: 99%

Parturition and Dystocia

Threlfall¹

2007

Current Therapy in Large Animal Theriogenology

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“…This pattern was attributed to the thermogenic action of P 4 , and the pre-estrous reduction of VT reflected CL regression [13,14,15]. On the other hand, studies in bovine [9], equine [16] and swine [17] based only on monitoring RT did not show such a pattern during the estrous cycle.…”

mentioning

confidence: 99%

Presence of a Temperature Gradient Among Genital Tract Portions and the Thermal Changes Within These Portions Over the Estrous Cycle in Beef Cows

et al. 2013

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The aim of the present study was to describe the temperature of the different portions of the female genital tract and their relation to rectal temperature and to investigate the effect of steroid hormones profiles on these variables over the estrous cycle in cattle. Four nonpregnant Japanese Black cows were investigated daily over two successive estrous cycles using a digital thermometer with a long probe and rounded-end sensor to record the temperature of the rectum (RT), vagina (VT), cervix (CT), uterine body (UBT) and uterine horns (UHT). Blood samples were collected immediately before temperature recording to assay peripheral levels of progesterone (P4) and estradiol-17β (E2). Moreover, transrectal ultrasonography was carried out after temperature recording to monitor the ovulatory follicle and track ovulation. During the experiment, the ambient temperature and relative humidity were recorded for further calculation of the temperature humidity index (THI). The temperature within the genital tracts in these cows progressively increased towards the uterine horns from the vagina. The VT, CT, UBT and UHTs were significantly higher in association with peripheral P4 concentrations greater than 4 ng/ml (mid-luteal phase) when compared with lower peripheral P4 concentrations. The VT was more significantly (P<0.01) correlated to the CT, UBT and UHTs than RT. In conclusion, a temperature gradient was present among the vagina, cervix and uterus over the estrous cycle, and changes in peripheral P4 concentrations were associated with the thermal variations within these portions. The VT could be more beneficial than RT in monitoring temperature of deeper portions of the female genital tract in bovine.

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Equine body temperature and progesterone fluctuations during estrus and near parturition

Cited by 16 publications

References 23 publications

Decreasing pH of mammary gland secretions is associated with parturition and is correlated with electrolyte concentrations in prefoaling mares

Decreasing pH of mammary gland secretions is associated with parturition and is correlated with electrolyte concentrations in prefoaling mares

Parturition and Dystocia

Presence of a Temperature Gradient Among Genital Tract Portions and the Thermal Changes Within These Portions Over the Estrous Cycle in Beef Cows

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