## 3 Results
\begin{table}
\begin{tabular}{l c c c c c} \hline \hline  & \(n\) * & **Min** & **Mean** & **Max** & **SD** \\ \hline
**Trial 1** & & & & & & \\
**Live weight, kg/hd** & 20 & 245 & 372.10 & 497 & 57.91 \\
**Days pregnant when VIT implanted** & 20 & 182.50 & 215.96 & 258.54 & 18.86 \\
**Days VIT remained implanted** & 17 & 3.42 & 31.13 & 71.39 & 18.50 \\
**Days VIT implant to expected calving date** & 19 & 13 & 57.47 & 91 & 19.30 \\
**Days between expected and observed calving date** & 16 & \(-10\) & 29 & 71 & 22.81 \\
**Time lapse- expelled to email (min)** & 20 & \(-87\) & 312.75 & 1285 & 430.05 \\
**Distance travelled- expelled to email (m)** & 8 & 0 & 178.75 & 750 & 310.10 \\
**Distance travelled- expelled to 1 h after (m)** & 8 & 0.59 & 158.92 & 643.60 & 268.17 \\
**Number of expelled alerts per animal** & 19 & 0 & 2.89 & 11 & 3.31 \\
**Number of No-contact alerts per animal** & 9 & 2 & 12.11 & 43 & 11.37 \\
**Time between alert and calf sighting (days)** & 14 & \(-4\) & 13 & 47 & 16.08 \\
**Vaginal temperature (internal) (\({}^{\circ}\)C)** & 17,192 & 37.13 & 38.82 & 40.76 & 0.48 \\ VIT temperature (all recorded) (\({}^{\circ}\)C) & 17,630 & 8.16 & 38.51 & 60.52 & 2.76 \\ Ambient temperature on date of VIT expulsion (\({}^{\circ}\)C)** & 12 & 12.80 & 22.77 & 33.90 & 5.82 \\ Ambient temperature over 60 d calving period (\({}^{\circ}\)C) & 60 & 7.50 & 22.00 & 35.60 & 6.33 \\
**Distance travelled-coupling days (km/d)** & 397 & 0.43 & 6.45 & 17.11 & 2.79 \\ Distance travelled on calving date (km/d)** & 8 & 0.93 & 5.54 & 12.98 & 4.11 \\
**Activity X-axis calving period (counts)** & 397 & 11.04 & 43.01 & 71.89 & 9.24 \\
**Activity X-axis- day of calving (counts)** & 8 & 25.89 & 35.95 & 46.89 & 5.88 \\
**Activity Y-axis calving period (counts)** & 397 & 8.59 & 38.38 & 87.13 & 12.14 \\
**Activity Y-axis- day of calving (counts)** & 8 & 15.28 & 33.61 & 58.06 & 13.57 \\
**Trial 2** & & & & & \\
**Live weight, kg/hd** & 10 & 402 & 455.90 & 494 & 30.80 \\
**Days pregnant when VIT implanted** & 10 & 152.08 & 152.08 & 152.08 & 0.00 \\
**Days VIT remained implanted** & 10 & 24 & 98.66 & 134.93 & 40.56 \\
**Days VIT implant to expected calving date** & 10 & 122 & 122 & 122 & 0.00 \\
**Time lapse- expelled to email (min)** & 5 & \(-8\) & 235 & 601 & 3.19 \\
**Days between expected and observed calving date** & 10 & \(-1\) & 12 & 33 & 9.00 \\
**Number of expelled alerts per animal** & 10 & 0 & 0.90 & 3 & 1.14 \\
**Number of No-contact alerts per animal** & 10 & 1 & 14.40 & 58 & 15.46 \\
**Vaginal temperature (internal) (\({}^{\circ}\)C)** & 105,233 & 37.60 & 38.49 & 40.91 & 0.30 \\ VIT temperature (all recorded) (\({}^{\circ}\)C) & 161,632 & 4.30 & 35.35 & 62.67 & 6.72 \\ Ambient temperature on date VIT expulsion **(\({}^{\circ}\)C)** & 8 & 15.30 & 21.98 & 27.10 & 3.94 \\ Ambient temperature over 60 d calving period (\({}^{\circ}\)C) & 60 & 14.10 & 27.43 & 37.00 & 4.87 \\
**Distance travelled non-calving days (km/d)** & 404 & 1.35 & 6.12 & 15.51 & 2.30 \\
**Distance travelled on calving date (km/d)** & 7 & 1.35 & 5.00 & 8.52 & 2.80 \\
**Activity X-axis calving period (counts)** & 404 & 18.07 & 30.97 & 50.26 & 6.35 \\
**Activity X-axis- day of calving (counts)** & 7 & 19.82 & 31.00 & 42.25 & 7.36 \\
**Activity Y-axis calving period (counts)** & 404 & 13.24 & 28.69 & 66.62 & 7.20 \\
**Activity Y-axis- day of calving (counts)** & 7 & 13.24 & 30.20 & 42.35 & 9.84 \\ \hline \hline \end{tabular}  
* \(n\) calculated from number of cows with confirmed information for each variable. ** Actual date and time of birth is different as no true birth alerts were received in trial 2.  
\end{table} 
Table 2: Descriptive statistics for Trial 1 and 2 showing the number of observations, minimum mean and maximum values and the standard deviation for key measurements recorded in each trial. Of the 20 collared animals in Trial 1, eight were true birth alerts (calf confirmed after receiving alert), eight were missed births (calf was seen but no alert received) and three were false alerts (alert received but no calf seen).