Sorry to hear of your loss.
People please remember:
Gases, whether in a hog operation, silo, manure pit, or some other aspect of the farm needs to be treated with respect. They are deadly and there are precautions that should be taken before entering an area of concern. We blow the silos out using the blower anytime we are filling the silo and have to go in it. The gases are there for several weeks after the silo is filled as the stuff forments.
Please becareful around equipment too. Remember to shut off PTO's before doing any work and shutting down the tractor is a lot more reliable way to make sure the equipment doesn't start up again. I know someone who lost part of his arm working on a round baler. He is lucky the people next to the field were outside and heard his cries for help or he would have bleed to death. You can bet he wishes he shut things down!
Use caution around the animals as you never know what they are going to do.
Farming is high on the list for injuries and death in the work place!
Things like this really get to me. That poor mother/grandmother. 
