Knowby
How many animals need to be weighed?
To get an accurate mob average you do not need to weigh every animal in the mob. It is dependent on the weight range of weights in the mob.
To get an accurate mob average you do not need to weigh every animal in the mob. It is dependent on the weight range of weights in the mob.
1
<p><span>To be 95% confident of mob average within 10kg it takes:</span></p><p><br></p><div>20 animals if the weight range is 100kg</div><div>35 animals if the weight range is 150kg</div><div>65 animals if the weight range is 200kg</div><p>&nbsp;</p>

To be 95% confident of mob average within 10kg it takes:


20 animals if the weight range is 100kg
35 animals if the weight range is 150kg
65 animals if the weight range is 200kg

 

2
<p>We use an average of all animals that have visited the unit in the past five days to calculate the mob average.&nbsp;</p><p><br>This means that 10-20 animals per day gives a five day average comprising of 40-60 or more animals.</p>

We use an average of all animals that have visited the unit in the past five days to calculate the mob average. 


This means that 10-20 animals per day gives a five day average comprising of 40-60 or more animals.

3
<p>With sampling there is always the chance of error. While we have seen this it is very rare and generally happens when mobs have been mixed e.g. animals that have seen the Optiweigh before with animals that haven't.</p>

With sampling there is always the chance of error. While we have seen this it is very rare and generally happens when mobs have been mixed e.g. animals that have seen the Optiweigh before with animals that haven't.