-Record the number of animals that are sick and dying due to a PED by note 1 time per week until the end of the trial. The death rate from all causes--saving others by note 1 time per week until the end of the trial.
- Record number of animals that are sick and dying because of a PED by note 1 times / week. Until the end of the experiment - the death rate from other causes by note 1 times / week until the end of the experiment.
Record number of animals sick and died due to a PED by noted 1 times a week until the end of the experiment - save mortality from other causes. By taking 1 times a week until the end of the experiment .