Influences of various factors on cows' entrance order into the milking parlour

This study investigates the stability of the milking order of cows entering into the milking parlour of a commercial dairy herd, and changes to this order consequent to a change in health status and a change in the membership of the group of cows being milked. In large herds it is difficult for stockmen to monitor all cows closely. If changes in the milking order are indicative of health or other problems, the monitoring of any changes in the order could alert stockmen to such problems. This could therefore be a tool to add to the parameters collected routinely in precision livestock farming (PLF). The milking process of 692 cows, in seven different feeding groups, over a period of six months, was monitored. The milking order was found to be stable within days, and across days, but was more variable within milking sessions. Cows with mastitis (P < 0.001) entered the parlour later than when they were healthy. Cows with metritis entered into the milking parlour earlier than usually (P < 0.05). When new cows entered a group they fitted into a stable position within the parlour entrance order within two days. There were no effects found of parity, age, days in milk, milk production or milking duration on the milking order. It is concluded that the regular monitoring of milking order, and flagging of changes in this order could be a useful tool in the early identification of the presence of disease in cows. (C) 2015 Published by Elsevier B.V.