Operators observe their animals on a regular basis and are best positioned to detect abnormal mortalities or other serious disease symptoms.
Breathnaíonn oibreoirí a gcuid ainmhithe ar bhonn rialta agus is iad is fearr is féidir mortlaíochtaí neamhghnácha nó comharthaí sóirt tromchúiseacha galair a bhrath.