Calving was observed 36±8 h after the application of the GSM device mainly in the night
time (Fig. 1). Approximately 15±5 min after setting the alarm, 62.5% of the fetuses
presented with their front limbs already out of the vulvar outlet. Among the primipara cows,
38% presented dystocia (33% for abnormal postures and 5% for fetal macrosomy), whereas
in the pluripara group 21% presented dystocia, all of fetal origin. The mean A.P.G.A.R.
score was 8.5. Furthermore, there was a significant reduction in both puerperal and neonatal
pathologies, both in the primipara and pluripara groups (Table 1). In the control group,
17.8% and 21.3% of pluripara and primipara cows, respectively, presented stillbirth, while
the experimental group did not present any occurrence of stillbirth. The rate of puerperal
abnormalities was higher in the control group with 17.6% of pluripara and 29.7% of
primipara cows being affected by endometritis. Comparatively, only 2.5% of the monitored