Check group membership
Recognise when the difference between two group weights is misleading.
Check your understanding
Match the animals as well as the dates
Compare the ear tags on the opening and closing sheets. Flag arrivals and departures. Equal head counts do not guarantee the same animals were weighed.
Try it yourself
Take two sheets and make three columns: present in both, opening only, closing only. Calculate gain using individual records you can actually match.
From the farm
Worked example
Tags A and B start at 300 and 310 kg, totalling 610 kg. At the end, tags A and C weigh 315 and 340 kg, totalling 655 kg. The 45 kg difference includes a change of animal. Tag A’s verified gain is 315 − 300 = 15 kg.
DALA.CAMP School / QUIZ
Check your understanding
A hint for this question
Compare the animal IDs in both records before subtracting the weights.
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