AI Article Synopsis

  • A commercial intravaginal thermometer was tested on 257 pregnant Holstein-Friesian cattle to see how well it predicts calving within 48 hours.
  • Factors like parity, season, time of day, and specific six-hour temperature intervals significantly influenced temperature changes before calving, while factors like calf weight and gestation length did not.
  • The thermometer showed moderate sensitivity (62.4%) for predicting calving within 48 hours but proved effective in alerting imminent calving with a perfect sensitivity (100%) for expulsion.

Article Abstract

In this study, the utility of a commercial intravaginal thermometer was evaluated as an automated method for the prediction of calving in a total of 257 healthy pregnant Holstein-Friesian female cattle. The accuracy and the sensitivity of predicting calving within 48 hr before calving were also evaluated. The intravaginal temperature changes from 72 hr before and up to calving were significantly (p ≤ .001) affected by parity, season (summer vs. autumn), the time of day (8 a.m. or 8 p.m.) and the 6-hr time intervals (38.19°C: first interval 0 to 6 hr before calving vs. 38.78°C: twelfth interval 66 to 72 hr before calving), while the gender (p = .943), and the weight of the calf (p = .610), twinning (p = .300), gestation length (p = .186), foetal presentation (p = .123), dystocia (p = .197) and retention of foetal membranes (p = .253) did not affect it significantly. The sensitivity of the SMS of expecting calving within 48 hr and the positive predictive value were 62.4% and 75%, respectively, while the sensitivity and the positive predictive value for the SMS of expulsion reached 100%. It can be concluded that the investigated thermometer is not able to predict calving within 48 hr accurately; however, imminent calving can be accurately alerted.

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Source
http://dx.doi.org/10.1111/rda.13803DOI Listing

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