Working on the farm, how many calories burned??

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Alright so I have a "farm". Well thats what others call it. 2 acres, goats, sheep, donkeys, pigs, chickens, dogs, 4 kids and a sweetheart. I say I am lightly active with all the jobs of a stay at home mom. But my question is how do I enter my "workouts" ie: cleaning out pens, building fence, wheelbarrowing. and such. I just can't figure it out and would love to get some feed back, so I can see how many calories I really am burning each day. Thanks so much!!